Ferns

Ferns are ideal for closed terrariums due to their love for high humidity and consistent moisture. Here are some of the best fern species for a closed terrarium:

Maidenhair Fern (Adiantum spp.):

Features: Maidenhair ferns have delicate, fan-shaped fronds that grow on wiry black stems. Their light, airy appearance adds a soft, ethereal quality to any terrarium.
Care: These ferns thrive in high humidity and indirect light. Keep the soil consistently moist but avoid waterlogging.


Boston Fern (Nephrolepis exaltata):

Features: Lush, feathery fronds that grow in a dense, bushy manner.
Care: Thrives in bright, indirect light and high humidity. Requires regular misting to keep the fronds healthy.


Bird’s Nest Fern (Asplenium nidus):

Features: Broad, wavy fronds that emerge from a central rosette, resembling a bird’s nest.
Care: Prefers indirect light and high humidity. Water the soil directly rather than the rosette to avoid rot.


Button Fern (Pellaea rotundifolia):

Features: Small, round leaflets along thin, wiry stems.
Care: Does well in low to medium light and high humidity. Keep the soil evenly moist.


Lemon Button Fern (Nephrolepis cordifolia ‘Duffii’):

Features: Small, rounded leaflets with a subtle lemon scent.
Care: Prefers bright, indirect light and high humidity. Keep the soil moist but allow the top layer to dry out slightly between waterings.


Kangaroo Paw Fern (Microsorum diversifolium):

Features: Glossy, dark green fronds with a distinctive, leathery texture.
Care: Thrives in medium to low light and high humidity. Regular watering is necessary to keep the soil moist.


Cretan Brake Fern (Pteris cretica):

Features: Variegated fronds with white or silvery stripes along the midrib.
Care: Prefers bright, indirect light and high humidity. Maintain consistent moisture in the soil.


Silver Brake Fern (Pteris ensiformis):

Features: Striking fronds with silvery-white stripes.
Care: Needs bright, indirect light and high humidity. Keep the soil moist but ensure good drainage.


Japanese Holly Fern (Cyrtomium falcatum):

Features: Dark green, holly-like fronds that are leathery and robust.
Care: Prefers medium light and high humidity. Water regularly to keep the soil consistently moist.


Heart Fern (Hemionitis arifolia):

Features: Heart-shaped leaves with a shiny, dark green appearance.
Care: Thrives in low to medium light and high humidity. Ensure the soil remains moist at all times.

Tips for Growing Ferns in a Closed Terrarium

Closed terrariums naturally retain moisture, creating a humid environment ideal for ferns. Mist the terrarium regularly if necessary opening the terrarium will also help with air circulation and prevent mould growth.. Keep the soil consistently moist but avoid waterlogging. Use a well-draining substrate to prevent root rot.

Ferns prefer indirect light. Place the terrarium near a window with filtered light or use artificial grow lights. Remove dead or yellowing fronds to keep the terrarium looking neat and to prevent decay.
By choosing the right fern species and providing proper care, you can create a lush, green oasis in your closed terrarium.

Regular Pruning:

Remove dead or yellowing fronds to keep the terrarium looking neat and to prevent decay.
By choosing the right fern species and providing proper care, you can create a lush, green oasis in your closed terrarium.

Fernery or fernerium

Fernery or fernerium

A collection of ferns in a terrarium is often referred to as a “fernery” or “fernerium.” These terms specifically describe a terrarium that is primarily dedicated to cultivating various species of ferns. Ferns thrive in humid environments, making them well-suited for terrariums where humidity and temperature can be controlled to create ideal growing conditions.

Creating a Fernery

If you are interested in setting up a fernery, here are some steps and tips to help you get started:

Choose a container that provides ample space for your ferns to grow. Glass containers, such as aquariums, glass jars, or specially designed terrariums, are ideal.

A lid helps maintain humidity, which is crucial for ferns. However, ensure there is some ventilation to prevent mold growth.

Add a layer of small pebbles or expanded clay pellets at the bottom to facilitate drainage and prevent waterlogging. Next add a thin layer of activated charcoal helps keep the terrarium fresh by absorbing odors and preventing mold.

Best to use a well-draining, organic-rich soil mix. A blend of potting soil, peat moss, and perlite works well for ferns.

Choose a variety of ferns that thrive in similar conditions. Some popular choices include Maidenhair Fern (Adiantum), Bird’s Nest Fern (Asplenium nidus), and Boston Fern (Nephrolepis exaltata). Arrange the ferns in the terrarium, ensuring they have enough space to grow. Plant taller ferns at the back and smaller ones at the front for a layered effect.

Maintain high humidity levels by misting the terrarium regularly. Using a humidity gauge can help you monitor the levels. Water the ferns regularly but avoid overwatering. The substrate should be moist but not soggy.

Positioning your creation, place the terrarium in a location with bright, indirect light. Avoid direct sunlight, which can overheat the terrarium and damage the ferns. 60-75°F (15-24°C) is an ideal temperature for most ferns

Trim dead or yellowing fronds to keep the terrarium looking neat and to prevent disease.

Inspect the ferns regularly for pests such as aphids or mites. If pests are found, treat them promptly with appropriate methods.

Feed the ferns with a diluted, balanced liquid fertilizer during the growing season, typically once a month. This will add lush greenery and a serene, natural beauty to any space. They are also known for their air-purifying properties, helping to improve indoor air quality. The presence of ferns can help increase humidity levels in the surrounding environment, which can be beneficial for other plants and your home’s overall air quality.

Creating a fernery allows you to enjoy the beauty and tranquillity of ferns within a controlled, miniature ecosystem. With proper care and maintenance, a fernery can be a stunning and low-maintenance addition to your home or office.