Keep in mind that their natural habitat is under the shady, wet canopy of a rainforest. Direct or improper light, inadequate air circulation, absence of moisture, unsuitable temperatures are all to be blamed. However, if your ferns arenât getting any rainfall, water them once or twice a week to keep them healthy. If the tray is empty, add water â¦ Apart from these, the fern â¦ While humidity is important, proper soil moisture is even MORE important. Your watering schedule will depend on how you plant your fern. Water your ferns once or twice a week if it isnât raining. The absolute most critical aspect of being able to grow ferns successfully is very careful attention to watering! During the summer, ferns growing outdoors often need to be watered in both the morning and the evening. Water: Maidenhair ferns are one of the few plants that you cannot over-water! Some ferns are desert plans that only want sporadic watering. Height : Depending on species, ferns can range from only 8 inches to 6 feet tall. Air plants are happy with a wide range of temps, from the 50s to the 90s. If natural rainfall isn't doing the job, make sure you provide your fern with sufficient water during its growing season. Point the water stream at the roots, not the fronds, to avoid damaging the plant. With adequate moisture, the plant may tolerate drier climates. For outdoor ferns, they prefer around 2 inches of water every week, and like being in the shade where their soil can stay moist. A good way to judge whether plants need water is to pick up the container. Water Boston ferns regularly. Ferns need regular moisture, and they can get it on their own if you live in a wet climate. Fertilize as needed. But can your grow Boston fern outdoors? Frost may kill the fern to the ground, but it will rebound in spring. Meanwhile, indoor ferns also prefer moist soil but will need to be monitored more on how much water to put. Consistent and evenly moist soil is essential to maintain a bright green, healthy glow. The good news here is that you have to work pretty hard to mess this one up. How often to water a fern depends on what kind of fern it is. Can a Boston Fern be Grown Outside? Different varieties of ferns can reach different sizes and are hardy in different zones, so read the tag before bringing a fern home. If itâs light, it needs to be watered; if is heavy, itâs fine. The easiest way to achieve this is to keep a deep tray under the pot they are in (self watering pots work great for this too.) Things to keep away from the fern are the bugs, snails, slugs, aphids, and the mites. Ferns like moisture. Some ferns are swamp plants that want to be constantly wet. Water ferns regularly to avoid dry soil. Watering Your Indoor Ferns. An Asparagus Fern is a plant that needs to be watered often but this doesnât mean that you should overwater your plant as in times of less sun and colder temperatures it will need a lot less water. Inadequate watering or hard water is one of the causes. Many people think that humidity is the most important topic in fern care but watering is MUCH more important! Just know that the hotter and drier the air, the more often youâll have to water. Hardiness : Zones 2â10, depending on the species. Read on to find out. You never want sopping wet soil, but consistently keeping the top five inches of your soil moist is the key to a healthy fern. They love to be consistently moist at all times. Feeding a Macho fern when it's actively growing also helps boost the plant's growth. Water Your Fern Regularly. Although Boston fern is often grown as a houseplant, it thrives outdoors in warm, humid climates in USDA zones 9-11.