Closed Terrarium Plants List – The Ultimate Guide To Creating
A closed terrarium plants list includes moisture-loving species like Fittonia, Selaginella, and mosses that thrive in high humidity. These plants utilize recycled water within a sealed glass container to create a self-sustaining miniature ecosystem.
For many of us in the aquarium hobby, the transition from underwater aquascaping to terrestrial “glass gardening” feels like a natural evolution. There is something deeply satisfying about creating a world that takes care of itself.
In my experience, the key to a successful setup isn’t just the glass jar or the soil; it is the specific selection of flora. Choosing from a closed terrarium plants list requires an understanding of how moisture and light interact in a confined space.
When I first tried building a terrarium, I made the mistake of using desert succulents. I quickly learned that the high humidity of a sealed environment turns succulents into mush within days.
To help you avoid those early pitfalls, I have compiled a comprehensive guide to the best species for your next project. We will look at why these plants work and how to keep them thriving for years to come.
Understanding the Closed Terrarium Ecosystem
A closed terrarium functions as a miniature version of Earth’s water cycle. Through the process of evapotranspiration, plants release moisture from their leaves, which then condenses on the glass walls.
This condensation eventually drips back down into the soil, watering the roots once again. This constant cycle maintains a high level of relative humidity, often reaching 80% or higher inside the vessel.
Because the air is stagnant and moist, you cannot simply use any houseplant. You need species that evolved in the damp understory of tropical rainforests.
The Importance of Drainage
Before we dive into the species, we must discuss the foundation. To prevent root rot, you need a “false bottom” or drainage layer.
I always recommend using Lightweight Expanded Clay Aggregate (LECA) as the base layer. These clay pebbles provide a space for excess water to sit away from the soil, preventing the roots from becoming waterlogged.
If you skip this step, you risk the growth of anaerobic bacteria. This leads to a foul-smelling terrarium and the eventual death of your chosen plants.
Pro Tip: Always place a fine mesh screen between your LECA drainage layer and your substrate. This prevents soil from washing down into the reservoir, which keeps your water clear and your drainage effective.
The Definitive closed terrarium plants list for Beginners
Selecting the right plants is about more than just aesthetics; it is about finding species that grow slowly and love damp feet. Below is a curated selection of the best performers I have used over the last decade.
1. Fittonia albivenis (Nerve Plant)
If there is one plant that belongs on every closed terrarium plants list, it is the Fittonia albivenis. These plants are famous for their striking leaf veins, which come in bright white, pink, or deep red.
They are incredibly expressive; if they run out of water, they will “faint” and look dead, only to perk up within hours of a misting. In a closed environment, they rarely faint because the humidity stays consistent.
2. Selaginella kraussiana (Spikemoss)
Despite its common name, this is not a true moss but a lycophyte. Selaginella kraussiana creates a lush, fern-like carpet that fills in gaps beautifully.
I have noticed that this plant acts as a great “humidity indicator.” If the tips start to turn brown or curl, your terrarium might be losing its seal or needs a tiny bit more water.
3. Biophytum sensitivum (Little Tree Plant)
For those who want a “centerpiece” plant that looks like a miniature palm tree, Biophytum sensitivum is the perfect choice. It stays small and has a unique reaction to touch.
Much like a Mimosa plant, its leaves will fold inward when disturbed or when the light fades at night. It thrives in the warm, damp conditions of a sealed glass container.
4. Soleirolia soleirolii (Baby’s Tears)
Soleirolia soleirolii is a classic terrarium plant because of its tiny, delicate leaves. It grows rapidly and will quickly cover the “floor” of your terrarium in a bright green mat.
Be careful, though, as it can be somewhat invasive. You may need to trim it back occasionally to prevent it from smothering smaller, slower-growing plants in your collection.
Essential Mosses and Ferns
No list of terrarium-friendly flora is complete without the soft textures of mosses and ferns. These plants provide the “ancient forest” look that many aquarists strive for.
The Versatility of Java Moss
Interestingly, many of the plants we use in our fish tanks work perfectly in terrariums. Taxiphyllum barbieri, commonly known as Java Moss, is a prime example.
While we usually grow it underwater, it transitions easily to emersed vs submerged growth. In a high-humidity terrarium, it will grow into a thick, dark green cushion over rocks and wood.
Miniature Ferns for Texture
Ferns like the Lemon Button Fern or the Asparagus Fern (which is technically a lily, but looks like a fern) are excellent for adding height. They provide a feathered texture that contrasts well with the broad leaves of Fittonia.
| Plant Species | Growth Habit | Light Requirement | Best For |
|---|---|---|---|
| Fittonia albivenis | Low/Spreading | Medium Indirect | Color & Texture |
| Selaginella kraussiana | Creeping Carpet | Low to Medium | Ground Cover |
| Biophytum sensitivum | Upright (Tree-like) | Medium Indirect | Centerpiece |
| Taxiphyllum barbieri | Clumping/Mossy | Low to High | Hardscape Covering |
Managing Light and Temperature
Once you have selected your species from the closed terrarium plants list, you must place the container in the right spot. Light is the engine that drives the ecosystem, but too much of it can be a disaster.
Direct sunlight acts like a magnifying glass through the walls of a glass jar. I have seen beautiful setups literally “cook” in a window because the internal temperature skyrocketed.
Artificial Lighting Solutions
If you don’t have a bright room with indirect light, artificial LEDs are your best friend. Understanding the light requirements for growth is just as important for terrariums as it is for planted tanks.
A small desktop LED lamp can provide a consistent spectrum without the heat spikes associated with natural sun. Aim for about 8 to 12 hours of light per day for optimal growth.
Temperature Stability
Most tropical terrarium plants prefer temperatures between 65°F and 80°F. If your home gets very cold in the winter, the metabolic rate of the plants will slow down, and you may see some die-back.
Avoid placing your terrarium near drafty doors or heating vents. Rapid temperature fluctuations can cause excessive condensation, which might lead to fungal issues.
Maintenance and the “Cleanup Crew”
Even though a closed terrarium is “self-sustaining,” it still requires a watchful eye. The most common problem in a new setup is the appearance of mold, specifically Botrytis cinerea (gray mold).
This fungus thrives in stagnant, overly wet conditions. If you see fuzzy white or gray patches on your plants, you need to intervene immediately by removing the affected leaves and airing out the jar.
Introducing Springtails
In my experience, the best way to prevent mold is to introduce a biological “cleanup crew.” Collembola, commonly known as Springtails, are tiny hexapods that eat mold, decaying plant matter, and fungus.
They are the “shrimp” of the terrarium world. Adding a small culture of Springtails turns your glass jar into a truly functioning ecosystem where waste is recycled into nutrients for the plants.
Common Mistake: Many beginners overwater their terrarium during the first week. If the glass is so foggy that you can’t see the plants at all, there is too much water. Open the lid for a few hours to let some moisture escape.
Troubleshooting Common Issues
Even with a perfect closed terrarium plants list, things can sometimes go wrong. Being able to read the signs your plants are giving you is a skill that comes with time.
Yellowing Leaves
Yellow leaves can mean two things: either the plant is getting too much water (root rot) or it is a natural part of the leaf’s lifecycle. If the whole plant turns yellow and soft, your substrate is likely too saturated.
Leggy Growth
If your plants are stretching toward the glass and look “thin,” they are searching for more light. This is common with Fittonia and ferns. Move the container to a slightly brighter location or increase the duration of your LED light.
Algae Growth on Glass
Just like in an aquarium, algae can grow on the glass walls of a terrarium if there is too much light and excess nutrients. You can simply wipe this away with a clean cloth or a cotton swab.
Conclusion
Building a world inside a bottle is a rewarding hobby that bridges the gap between traditional gardening and aquascaping. By selecting the right species from a closed terrarium plants list, you set yourself up for long-term success.
Remember to focus on humidity-loving plants like Fittonia albivenis and Selaginella kraussiana. Ensure you have a solid drainage layer of LECA and a reliable cleanup crew of Springtails to keep the environment healthy.
With a little patience and the right environmental balance, your terrarium will become a beautiful, self-sustaining piece of living art. It is a testament to the resilience of nature and a perfect addition to any fish keeper’s home.
Frequently Asked Questions
How often should I water a closed terrarium?
If the seal is tight, you may only need to add a few drops of water every 4 to 6 months. Watch for the lack of condensation on the glass as a sign that it is time to mist.
Can I use succulents in a closed terrarium?
No, succulents and cacti require low humidity and high airflow. They will rot very quickly in a sealed container. Stick to tropical species that love moisture.
Why is my terrarium foggy in the morning?
Some fogging in the morning and evening is normal due to temperature shifts. However, if the glass remains completely obscured all day, there is too much water in the system.
Do I need to fertilize my terrarium plants?
Generally, no. You want your plants to grow slowly so they don’t outgrow the container too quickly. The decaying matter processed by Springtails usually provides enough nutrients.
How long can a closed terrarium last?
With the right plants and light, a closed terrarium can last for years or even decades. Some famous examples have remained sealed for over 40 years!