Best Plants for a Closed Terrarium: Beginner Guide

A sealed terrarium creates a humid miniature environment, making plant choice especially important. You want compact species that enjoy moist air, not plants that need dry soil between waterings.

Quick answer

Fittonia, small tropical ferns, selaginella and suitable live moss are useful beginner options for a closed terrarium. Choose species with similar light and moisture requirements, and always check their mature size.

Six beginner-friendly options

1. Fittonia (nerve plant): colourful leaves, compact habit and a preference for humidity. Trim it when necessary.
2. Button fern: fine foliage that enjoys consistent moisture without soggy roots.
3. Lemon button fern: a smaller fern option for a woodland-style display.
4. Selaginella: a spreading tropical groundcover with delicate foliage.
5. Live sheet moss: covers exposed substrate and helps create a woodland appearance. Buy responsibly cultivated moss instead of collecting unidentified wild species.
6. Compact tropical peperomia: some smaller species work in humid settings, although requirements vary. Check the particular variety.

Plants that usually do not belong in a closed terrarium

Most cacti, succulents, lavender and rosemary prefer more airflow and drier conditions. Combining a desert plant and a moisture-loving fern gives you conflicting care requirements.

How to make your shortlist

1. Measure the jar’s usable height and diameter.
2. Select two or three small plants that prefer similar conditions.
3. Inspect leaves and roots for pests or decay.
4. Use an appropriate potting substrate and water conservatively. Gravel at the bottom does not drain water out of a sealed container.
5. Place in bright indirect light, then adjust moisture based on condensation and plant condition.

Frequently asked questions

Can succulents survive in a closed terrarium?

Most are poor choices because sealed jars stay humid and do not let soil dry quickly.

Does a closed terrarium need direct sunlight?

No. Direct sunshine can rapidly overheat glass. Bright indirect light is safer.

How many plants should I use?

There is no fixed number. In a small jar, a few well-spaced plants usually work better than overcrowding.

Build your terrarium next

Follow our step-by-step closed terrarium project, or try the simpler pothos propagation guide.

Further reading

For general houseplant care, consult the Royal Horticultural Society’s houseplant resources. Always follow the care requirements of your specific plant rather than treating all tropical species as identical.

Editorial note: This guide is based on general horticultural guidance; it is not presented as an original plant trial.