Bird’s Nest Fern Care: Light, Water & Growing Tips

The bird’s nest fern is one of those houseplants that can instantly make an indoor space feel more tropical. Instead of producing the divided, feathery fronds associated with many ferns, it develops broad, glossy green leaves that rise from a central rosette resembling a nest. Its lush appearance may look demanding, but bird’s nest fern care becomes much easier once you understand how the plant naturally grows. Light, moisture, humidity, soil quality, and temperature all influence how healthy the foliage remains. The biggest mistakes usually come from giving the plant too much sun or allowing water to collect inside its crown. With a few adjustments, even relatively new plant owners can keep this tropical fern looking full and vibrant.

Known botanically as Asplenium nidus, the bird’s nest fern originates from warm, humid tropical environments where it often grows beneath forest canopies. Those natural conditions explain why the plant appreciates filtered light, steady moisture, warmth, and relatively high humidity indoors. Unlike drought-tolerant houseplants, it does not enjoy completely drying out between waterings, although constantly saturated soil can be equally damaging. Understanding that balance is the key to avoiding problems such as brown leaf edges, yellow fronds, root rot, and slow growth. Indoor conditions will never perfectly recreate a rainforest, and fortunately they do not need to. Consistent care matters far more than trying to create an overly complicated plant-care routine.

A healthy bird’s nest fern can become an impressive statement plant, with mature fronds extending outward in an elegant fountain-like shape. Some varieties have straight leaves, while others develop rippled, wavy, or heavily crinkled margins that add even more texture. Regardless of the variety you grow, the basic bird’s nest fern growing requirements remain similar. This guide explains how much light the plant needs, when and how to water it, what humidity level works best, which soil to use, and how to prevent common growing problems. You will also learn how to recognize what the plant is communicating through changes in its leaves. With attentive but uncomplicated care, a bird’s nest fern can remain attractive indoors for many years.

Understanding How a Bird’s Nest Fern Naturally Grows

Bird’s nest ferns behave differently from many familiar potted houseplants because their natural growth habit is closely connected to tropical forests. In the wild, they may grow on trees, rocks, or organic material rather than rooting deeply into ordinary garden soil. Their roots often secure the plant while accumulated leaves and debris around them provide moisture and nutrients. This explains why a loose, airy growing medium is generally better than dense soil that remains waterlogged. The plant’s wide fronds are designed to capture filtered light while avoiding the intense sunshine found above a forest canopy. Recreating those general conditions indoors helps prevent many of the problems that people mistakenly attribute to a difficult or sensitive plant.

The most recognizable feature of an Asplenium nidus is the central rosette from which new fronds emerge. Young leaves appear tightly rolled or folded near the middle before gradually opening and expanding outward. This central growing point is especially important because damage or rot there can permanently affect future growth. Pouring water directly into the crown may cause moisture to remain trapped between emerging leaves, particularly when indoor airflow is limited. For that reason, watering around the potting medium is usually safer than filling the center of the plant. Keeping the crown healthy allows new leaves to continue emerging naturally and helps the fern maintain its characteristic symmetrical appearance.

Bird’s nest fern leaves can reach an impressive size when the plant receives consistent care and enough room to develop. Mature fronds are usually brighter or lighter green when they first emerge before darkening as they age. Because the leaves are broad and relatively thin, moisture loss can happen quickly when the surrounding air becomes excessively dry. This is one reason crispy edges commonly appear during winter heating or in rooms with strong air conditioning. Older outer fronds may eventually discolor and decline even when the plant itself is perfectly healthy. Learning to distinguish normal leaf aging from a broader care problem prevents unnecessary changes to watering, fertilizer, or light that could create additional stress.

Growth speed depends heavily on temperature, light, humidity, plant maturity, and the time of year. Bird’s nest ferns generally grow more actively during warm, bright periods and may slow noticeably when days become shorter or indoor temperatures decrease. A slower-growing fern does not automatically require additional fertilizer, water, or repotting. Trying to force rapid growth during naturally slower periods may instead contribute to root damage or nutrient buildup in the soil. Focus on healthy new fronds rather than expecting a certain number of leaves each month. Steady growth accompanied by firm, clean foliage usually indicates that the plant’s basic environmental requirements are being met.

Another important characteristic is the delicate surface of bird’s nest fern fronds. The leaves can crease, bruise, or tear when they are repeatedly handled, rubbed against furniture, or placed in busy walkways. Damaged sections will not repair themselves, even though the plant can continue growing perfectly well afterward. Choose a location where the fern has enough space for its leaves to extend naturally without constant contact. Occasional gentle cleaning is useful because broad fronds can collect dust that reduces their ability to use available light efficiently. Understanding the plant’s structure and natural habits makes every other part of bird’s nest fern care easier to manage.

How Much Light Does a Bird’s Nest Fern Need?

Bright indirect light is generally the best choice for growing a bird’s nest fern indoors. The plant needs enough illumination to support photosynthesis and healthy frond development, but strong direct sunshine can scorch its relatively tender foliage. A location near an east-facing window often provides gentle morning light without prolonged exposure to harsh afternoon sun. North-facing windows can also work when the room remains reasonably bright throughout the day. Near brighter south- or west-facing windows, moving the fern several feet back or filtering sunlight through a sheer curtain can protect the leaves. The goal is consistent brightness without allowing hot sunlight to strike the foliage for hours at a time.

Too much light commonly produces pale patches, bleached areas, crispy sections, or brown scorch marks on exposed fronds. These symptoms may be especially noticeable on the side of the plant facing the window. Sun damage can sometimes be confused with underwatering because both conditions may create dry brown tissue. Check where the damage appears and consider whether direct sunlight reaches the leaves during the brightest part of the day. Moving the fern to slightly softer light prevents additional scorching, although existing damage will remain visible. Avoid suddenly transferring a plant from deep shade into a bright sunny window because dramatic environmental changes can create unnecessary stress.

Although bird’s nest ferns tolerate lower light better than many sun-loving houseplants, extremely dark locations can still weaken growth. A fern receiving insufficient light may produce smaller fronds, grow very slowly, lean toward the nearest window, or develop a less dense appearance. Wet soil also dries much more slowly in low light, increasing the risk of root problems when watering habits are not adjusted. If the soil stays moist for unusually long periods, consider whether poor light is contributing to the issue. Moving the plant closer to a bright window without exposing it to intense direct sun can improve both growth and moisture management. Balanced light makes proper bird’s nest fern watering significantly easier.

Seasonal changes should also influence where you keep the plant. A location that receives gentle light during winter may become considerably brighter when the sun’s angle changes during another part of the year. Similarly, surrounding trees can shade a window during summer but allow much stronger sunlight through after their leaves fall. Check the fern occasionally rather than assuming a previously successful location will remain identical throughout the year. Gradual adjustments are usually better than repeatedly moving the plant from one extreme environment to another. Consistency encourages stable growth, but responding to meaningful seasonal changes helps protect foliage from unexpected sun exposure.

If your home does not provide sufficient natural light, artificial grow lights can support bird’s nest fern growth. Choose a light intended for houseplants and position it far enough away that the foliage does not become heated or bleached. The exact distance depends on the strength of the light, so observing the plant is more useful than relying on one universal measurement. Fronds that remain healthy, green, and steadily growing usually indicate an appropriate setup. Artificial lighting can be particularly useful in offices, interior rooms, or during darker winter months. Whether the light comes from a window or a lamp, moderate and consistent illumination is more suitable than intense exposure.

How to Water a Bird’s Nest Fern Correctly

Proper watering is one of the most important parts of bird’s nest fern care because the plant prefers moisture without remaining constantly saturated. Instead of following a rigid calendar, check the potting mix before adding more water. The upper portion of the soil can become slightly dry while the lower root zone remains lightly moist. When the surface begins losing moisture, water thoroughly enough to evenly hydrate the growing medium and allow excess water to escape through drainage holes. Never allow the pot to sit continuously in a saucer filled with water. This approach provides reliable moisture while still allowing oxygen to reach the roots.

How often you need to water depends on several environmental factors rather than the plant species alone. Warm temperatures, brighter light, smaller containers, and lower humidity usually cause the potting mix to dry faster. Cooler rooms, low light, large pots, and higher humidity can keep the soil moist for considerably longer. A fern might need more frequent watering during active summer growth and noticeably less during winter. Checking the soil is therefore more accurate than deciding that every bird’s nest fern needs water every seven days. Developing the habit of observing moisture levels prevents both chronic underwatering and the more dangerous problem of keeping roots permanently waterlogged.

When watering, direct the water toward the soil around the plant rather than pouring it directly into the central rosette. The crown is where new fronds emerge, and water trapped there may encourage decay when evaporation is slow. This concern becomes especially important in cooler indoor environments with limited airflow. Watering around the edge of the root zone allows moisture to reach the plant without repeatedly soaking its growing point. If water accidentally enters the crown, there is usually no reason to panic, particularly when conditions are warm and airy. The bigger concern is making crown saturation a regular part of the watering routine.

The type and quality of water can occasionally affect leaf appearance, especially when a fern develops unexplained brown tips despite otherwise good care. Some household water contains relatively high concentrations of dissolved minerals or treatment chemicals that may gradually accumulate in the potting mix. Sensitive plants sometimes respond better to filtered, rain, or lower-mineral water, although changing water sources is not always necessary. Before blaming water quality, examine more common causes such as dry air, inconsistent watering, fertilizer buildup, or excessive sunlight. Flushing the potting mix thoroughly from time to time can help remove accumulated soluble salts. Always allow excess water to drain completely after flushing.

Underwatering usually causes the foliage to become less firm, curl slightly, or develop dry brown margins, while prolonged overwatering may lead to yellowing, soft tissue, or root decline. However, symptoms can overlap, which makes checking the soil essential before changing your routine. A wilted plant sitting in wet soil does not need additional water simply because the leaves look tired. In that situation, stressed roots may no longer be functioning efficiently enough to supply moisture to the foliage. Consistent moderate watering is safer than repeatedly allowing the fern to become extremely dry and then soaking it heavily. Healthy bird’s nest fern roots benefit most from stable moisture and good drainage.

Humidity and Temperature for Healthy Fern Growth

Humidity plays a major role in how attractive bird’s nest fern foliage remains over time. As a tropical fern, the plant naturally experiences more atmospheric moisture than is available in many indoor homes. Moderate to high household humidity can help maintain smooth green fronds and reduce the risk of crispy edges. Bathrooms and kitchens with suitable light are sometimes excellent locations because humidity naturally rises during everyday activities. However, humidity should not come at the expense of adequate airflow or appropriate light. A warm, reasonably humid room with stable conditions is generally more valuable than constantly chasing an exact humidity percentage.

Dry air becomes especially noticeable during colder months when indoor heating systems operate for long periods. Heated air can reduce surrounding humidity and increase moisture loss from broad fern leaves even when the soil remains adequately watered. Placing the plant near a humidifier is one of the most reliable ways to improve conditions when household air is consistently dry. Grouping several tropical plants together may create a slightly more humid microenvironment, although the effect is usually modest. A pebble tray can add some localized moisture but should not be expected to dramatically transform room humidity. Watch the foliage rather than assuming every brown edge automatically requires more soil moisture.

Misting is frequently recommended for tropical houseplants, but it should be viewed as optional rather than essential bird’s nest fern care. Spraying the foliage creates only a temporary increase in moisture and does not replace consistently suitable room humidity. Frequent misting can also leave the crown or leaf surfaces wet for extended periods when airflow is poor. If you enjoy misting, use clean water lightly and allow the plant to dry normally afterward. Avoid repeatedly saturating the central growing point because trapped moisture can contribute to rot. A properly placed humidifier provides a more stable solution for very dry environments than occasional heavy spraying.

Temperature stability is equally important because bird’s nest ferns prefer warm conditions and dislike prolonged exposure to cold. Comfortable indoor temperatures suitable for people generally work well for this tropical plant. Problems can develop when the fern sits next to cold winter windows, exterior doors, heating vents, fireplaces, or powerful air-conditioning outlets. Sudden temperature fluctuations can stress leaves and slow new growth even when watering and light appear appropriate. Choose a location where temperatures remain reasonably stable throughout the day and night. Protecting the fern from drafts is especially useful during winter, when glass surfaces and frequently opened doors can create surprisingly cold pockets of air.

Warmth, humidity, and watering are closely connected, so these factors should always be evaluated together. A fern in a warm, humid, brightly lit room may use water relatively quickly because active growth increases moisture demand. The same plant moved into a cooler, darker room may remain wet much longer and therefore require less frequent watering. Adjusting care according to actual growing conditions prevents problems caused by rigid routines. Healthy plants respond to their environment rather than to a calendar, which is why observation is one of the most valuable plant-care skills. Stable warmth combined with moderate humidity, indirect light, and careful watering creates an ideal foundation for vigorous bird’s nest fern growth.

Best Soil, Pots and Fertilizer for Bird’s Nest Ferns

Bird’s nest ferns grow best in a potting medium that retains some moisture while still allowing excess water and air to move freely. Dense garden soil is rarely appropriate indoors because it can compact around the roots and remain saturated for too long. A quality houseplant mix can be improved with airy ingredients that support drainage and root oxygen. Materials commonly used in tropical plant mixes include fine bark, coco coir, perlite, or similar components that create structure without allowing the soil to become excessively heavy. The exact recipe is less important than the final texture and drainage. A good mix should absorb water evenly without turning into a dense, muddy mass.

Pot selection has a significant influence on moisture management. Always use a container with functional drainage holes so excess water has somewhere to escape after watering. Decorative cachepots can still be used, but the inner growing pot should be removed or thoroughly drained before being returned to the decorative container. Choosing an oversized pot can create problems because the large volume of unused soil may remain wet much longer than the root system can handle. When repotting, increase container size gradually rather than moving a relatively small fern into a dramatically larger pot. Matching the pot reasonably closely to the root system helps maintain more predictable moisture levels.

Bird’s nest ferns generally do not need frequent repotting simply because the calendar says another year has passed. Consider repotting when roots become crowded, the growing medium breaks down and compacts, drainage becomes poor, or the plant has clearly outgrown its container. Handle the root system carefully because unnecessary disturbance can temporarily slow growth. Repotting is often easiest during a warmer period when the fern is actively growing and can recover more efficiently. Position the plant at approximately the same depth it occupied previously rather than burying the central crown. After repotting, focus on stable conditions instead of immediately adding strong fertilizer to encourage rapid growth.

Fertilizer can support healthy foliage, but bird’s nest ferns are not especially heavy feeders. A balanced houseplant fertilizer applied at a diluted strength during active growth is usually sufficient. Overfertilizing creates more problems than slightly underfeeding because soluble salts can accumulate around the roots and contribute to brown leaf tips or root stress. Never assume slow growth automatically means the fern is hungry, since insufficient light, cool temperatures, or natural seasonal changes can produce the same result. Apply fertilizer only to healthy plants growing under suitable conditions. Reducing or pausing feeding during periods of noticeably slower growth can prevent unnecessary nutrient buildup in the soil.

If white crusts appear on the soil surface or pot edge, mineral and fertilizer salts may be accumulating. Occasional thorough watering that allows plenty of liquid to drain from the bottom can help flush excess salts from the root zone. This is another reason containers with proper drainage are essential for long-term bird’s nest fern health. Never increase fertilizer concentration because you want larger leaves quickly; healthy growth is gradual and depends on the entire environment. Appropriate light, moisture, humidity, and root conditions have a greater influence on overall appearance than aggressive feeding. Think of fertilizer as a supplement to good growing conditions rather than a substitute for them.

Pruning, Cleaning and Encouraging Better Growth

Bird’s nest ferns do not require complicated pruning because their natural rosette shape develops without regular trimming. Most pruning involves removing old, badly damaged, or fully yellowed outer fronds when they no longer contribute to the appearance of the plant. Use clean, sharp scissors or pruning shears and cut unwanted foliage close to its base without damaging nearby healthy tissue. Avoid cutting into the central crown because that area produces future leaves. Partially damaged leaves can be left in place if they remain mostly green and functional. Removing every leaf with a small cosmetic flaw can unnecessarily reduce the plant’s ability to photosynthesize.

Cleaning the foliage is particularly useful because the broad fronds collect more visible dust than finely divided fern leaves. Dust can dull the plant’s appearance and reduce the amount of available light reaching the leaf surface. Support each frond gently while wiping it with a soft damp cloth, taking care not to crease or tear it. Avoid aggressive commercial leaf-shine products, which are unnecessary for maintaining naturally healthy foliage. A gentle shower can sometimes clean the plant effectively, but keep excess water from collecting in the crown and allow the fern to drain thoroughly afterward. Regular light cleaning also gives you an opportunity to inspect the plant for pests or developing problems.

Rotating the pot occasionally can encourage more balanced growth when light reaches the plant mainly from one direction. Without rotation, leaves may gradually orient themselves toward a nearby window, creating an uneven shape. Turn the plant gradually rather than changing its orientation constantly, because foliage naturally responds to available light. If the fern repeatedly leans strongly toward one side, improving overall illumination may be more helpful than simply rotating it. Newly emerging fronds are particularly useful indicators of current growing conditions. Healthy new leaves that gradually enlarge suggest that the plant has enough energy, moisture, and warmth to maintain active development.

Many growers want to know how to make a bird’s nest fern grow faster or produce dramatically larger fronds. There is no safe shortcut that replaces good environmental conditions, and excessive fertilizer often creates more harm than improvement. Providing bright filtered light, reliable moisture, warmth, humidity, and enough root space gives the plant the strongest foundation for natural growth. Mature specimens may produce larger foliage than younger plants even when both receive identical care. Genetics and cultivar also influence eventual frond size, texture, and shape. Instead of chasing maximum growth speed, aim for steady production of firm green leaves without repeated periods of stress.

Bird’s nest fern propagation is less straightforward than propagating houseplants from stem or leaf cuttings. These ferns naturally reproduce through spores, which appear on the undersides of mature fronds and require specific conditions to develop successfully. A detached leaf will not simply root and create a new bird’s nest fern in the way some other houseplants can. Spore propagation is possible for experienced growers, but it is slow and requires patience, cleanliness, humidity, and careful environmental control. For most indoor gardeners, purchasing another plant is considerably easier than propagating one at home. Understanding this limitation prevents unnecessary cutting of healthy fronds in an attempt to produce new plants.

Common Bird’s Nest Fern Problems and How to Fix Them

Brown leaf tips are one of the most common bird’s nest fern problems, and several different conditions can cause them. Dry air, inconsistent watering, fertilizer salts, water quality, and excessive sunlight are all possible contributors. Before changing several parts of your routine simultaneously, look at the entire growing environment and identify the most likely cause. If the soil repeatedly becomes extremely dry, improving watering consistency may help, while a fern beside a heating vent may benefit more from increased humidity or relocation. Slight browning on older fronds is not always a serious problem. Focus on preventing damage to new growth rather than expecting older injured leaves to become green again.

Yellow leaves can also have multiple explanations, including normal aging, excessively wet soil, poor drainage, low light, or root stress. One yellowing outer frond on an otherwise healthy mature plant is usually less concerning than several leaves changing color at the same time. Feel the potting medium and consider how long it has remained wet before assuming the plant needs additional water. If the soil smells sour, remains saturated for extended periods, or the roots appear dark and soft, root rot may be developing. Improving drainage and removing severely decayed roots may be necessary in advanced cases. Preventing chronic overwatering is much easier than restoring a plant after significant root damage.

A damaged or rotting crown requires immediate attention because the center of the plant produces new growth. Symptoms may include darkened tissue, unpleasant odors, soft emerging leaves, or new fronds that collapse before properly opening. Regularly pouring water into the central rosette can increase the risk, particularly when temperatures are cool and airflow is limited. Stop wetting the crown and evaluate whether the potting mix is also remaining excessively moist. Severely damaged growing points may not recover, which is why prevention is so important. Watering the surrounding root zone instead of the center is a simple habit that can significantly reduce crown-related problems.

Pests are not always a major issue, but bird’s nest ferns can occasionally attract common indoor plant pests such as scale, mealybugs, or other sap-feeding insects. Inspect both sides of the fronds, the bases of leaves, and the central area when cleaning the plant. Sticky residue, unusual bumps, cotton-like material, distorted growth, or tiny moving insects may indicate an infestation. Isolate an affected plant from nearby houseplants while you determine an appropriate treatment. Gentle physical removal and houseplant-safe pest treatments can be effective when infestations are discovered early. Always test unfamiliar sprays cautiously because fern foliage can sometimes react sensitively to strong products.

Misshapen or stunted new leaves often indicate that current growing conditions deserve closer attention. Very low humidity, temperature stress, pest activity, root problems, or inconsistent watering can interfere with normal frond development. Avoid pulling, unfolding, or manipulating young leaves because emerging foliage is delicate and can be permanently damaged by handling. Instead, evaluate the plant’s environment and correct obvious problems gradually. Healthy future leaves are a better measure of improvement than old damaged foliage, which will not repair itself after conditions change. Bird’s nest fern recovery can require patience, but consistent care often allows the plant to resume attractive new growth once the underlying source of stress is corrected.

Choosing the Best Location for a Bird’s Nest Fern Indoors

Finding the right location can solve several bird’s nest fern care challenges before they develop. Look for an area that receives bright filtered light while remaining protected from strong direct afternoon sunshine. The location should also stay reasonably warm and free from cold drafts or constant blasts from heating and cooling vents. Kitchens, bright bathrooms, living rooms, and home offices can all work when these basic conditions are available. Avoid choosing a spot based only on decoration because the prettiest position may not provide the plant with enough usable light. A healthy fern will ultimately look better than one struggling in a fashionable but unsuitable corner.

Bathrooms are frequently suggested because their naturally humid conditions can benefit tropical plants. However, a bathroom without adequate daylight is not automatically a good home for a bird’s nest fern. Humidity cannot compensate for extremely low light, and constantly damp soil in a dark room can increase the chance of root problems. A bathroom with a bright frosted window or suitable artificial plant lighting may provide excellent conditions. Observe whether the room remains warm enough, especially during winter. Combining sufficient light with naturally higher humidity makes the bathroom environment genuinely useful rather than relying on humidity alone.

A kitchen can offer similar advantages because cooking and washing periodically increase atmospheric moisture. Keep the fern away from hot stovetops, ovens, smoke, grease, and areas where temperature changes dramatically. A bright counter or shelf near a filtered window can work particularly well when the foliage has enough room to expand. Remember that mature bird’s nest fern fronds may become much wider than the young plant you originally purchased. Providing space from the beginning reduces the need to repeatedly relocate the fern. Like many houseplants, bird’s nest ferns generally respond better to a stable suitable location than to frequent movement around the home.

Bedrooms and living rooms can also provide excellent conditions when humidity is moderate and indirect light is available. If household air becomes very dry, especially during winter heating, a nearby humidifier can make these locations more comfortable for tropical foliage. Keep enough distance between the fern and radiators, heating vents, air conditioners, and frequently opened exterior doors. Window placement should also be evaluated carefully because glass can become very cold at night in winter or extremely hot under intense summer sunlight. Small differences in positioning can significantly change the microclimate surrounding the plant. Moving a fern just a short distance away from problematic direct sun or airflow can improve its appearance.

Once you find a location where the plant consistently produces healthy new fronds, avoid making changes without a clear reason. Houseplants adapt to predictable patterns of light, temperature, humidity, and moisture, and unnecessary relocation can temporarily disrupt those conditions. Continue monitoring seasonal changes because a successful summer position may require adjustment during winter or vice versa. Use new foliage as your best indicator of whether the environment remains suitable. Firm, evenly colored leaves emerging regularly suggest that your bird’s nest fern growing conditions are working. Creating the right location is less about finding a perfect room and more about providing a stable combination of filtered light, warmth, moisture, humidity, and protection.

Frequently Asked Questions About Bird’s Nest Fern Care

How often should I water a bird’s nest fern?

Water when the upper layer of potting mix begins to lose moisture rather than following a strict weekly schedule. Keep the root zone lightly and consistently moist, but never leave the plant sitting in water or permanently saturated soil.

Can a bird’s nest fern survive in low light?

A bird’s nest fern can tolerate relatively low indoor light, but very dark conditions usually produce slower and weaker growth. Bright indirect light generally encourages larger, healthier fronds while reducing the problems associated with soil staying wet for too long.

Why are the tips of my bird’s nest fern turning brown?

Brown tips can result from low humidity, inconsistent watering, excessive fertilizer, mineral buildup, or strong direct sunlight. Check the plant’s entire environment before increasing watering because adding more moisture to already-wet soil can worsen the problem.

Should I mist my bird’s nest fern?

Misting is optional and provides only a temporary increase in moisture around the foliage. A humidifier or naturally humid room is more effective when household air is consistently dry, and you should avoid repeatedly soaking the fern’s central crown.

Is a bird’s nest fern easy to care for?

Bird’s nest ferns can be relatively manageable indoor plants once their basic needs are understood. Give them bright indirect light, consistent but not excessive moisture, warmth, moderate humidity, good drainage, and protection from water collecting in the central crown.