11 Best Plants for Closed Terrariums

You’ve probably stared at those gorgeous glass terrariums online and wondered if you could actually keep plants alive in one without turning it into a moldy mess. Here’s the good news: closed terrariums are basically self-sustaining little worlds that practically take care of themselves! Last year, I forgot about my terrarium for three weeks while traveling for work, and when I returned, I expected to find dead plants. Instead, I discovered the most lush, vibrant mini-ecosystem I’d ever seen – the humidity had created perfect growing conditions without any intervention from me. Ready to discover which green beauties will make your terrarium thrive?

AI Summary

• Fittonia (Nerve Plant) thrives in humid conditions with vibrant veined leaves, requiring bright indirect light and moist soil.
• Maidenhair ferns and carpet moss create lush ground cover, needing high humidity above 60% and consistently moist conditions.
• Peperomia species offer diverse leaf patterns, store water in fleshy leaves, and are hardy plants ideal for low-light environments.
• Baby Tears forms dense green carpets with tiny leaves, spreading horizontally while loving high humidity and indirect light.
• Selaginella (Spikemoss) provides prehistoric textures in compact 3-5 inch plants that are pet-safe and thrive in warm, humid conditions.

Fittonia (Nerve Plant): Vibrant Veined Beauty for Humid Spaces

When you’re looking for the perfect plant to add some life to your closed terrarium, you really can’t go wrong with Fittonia. This nerve plant has these amazing veined leaves that are just incredible to look at – it’s basically like having a tiny piece of stained glass art from nature.

Fittonia really thrives in the humid conditions that closed terrariums provide naturally. Its like giving your plant its own little tropical paradise. You can find multiple varieties like verschaffeltii or albivenis that offer vibrant colors and striking contrast for your display.

Creating a cozy humid microclimate for your Fittonia is like crafting the perfect miniature rainforest retreat.

You’ll want to put your terrarium somewhere with bright but indirect light, because direct sunlight will actually damage those pretty leaves pretty quickly.

The soil should stay moist but not waterlogged (plants don’t like soggy roots any more than we’d like soggy socks). Since closed terrariums recycle their own moisture, you won’t need to water very often at all.

Every now and then, pinch back some of the stems to keep your Fittonia looking bushy and healthy.

Pilea ‘Greyzy’: Silvery Elegance With Low-Maintenance Appeal

If you’re looking for something a bit unique for your closed terrarium, Pilea ‘Greyzy’ might just become your latest favorite. This gorgeous trailing plant has silvery-grey leaves that really make your other plants look plain in comparison. It’s basically like adding some metallic shimmer to your green setup, which creates this really nice contrast that just looks classy.

The way it grows is pretty cool – it stays compact but still trails nicely, so it works great cascading over the edges of your terrarium or just filling in spaces at the bottom. And here’s a bonus, its pet-safe so you dont have to panic if your nosy cat wants to check it out.

This little guy grows pretty fast and actually loves the humid conditions inside closed terrariums, which means less work for you. Unlike many plants that struggle with temperature changes, this one is quite sensitive to fluctuations, so the stable environment of a closed terrarium is actually perfect for keeping it happy.

If you want to expand your collection it makes these cute little “babies” that are super easy to propagate. Just make sure it gets bright indirect light and soil that drains well, and you should be all set.

Peperomia Species: Compact Charm With Diverse Leaf Patterns

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Peperomias are basically the Swiss Army knife when it comes to terrariums – there’s honestly something for just about everyone. With more than 1,000 different species out there, you can find heart-shaped leaves, those cool watermelon patterns, silvery ripples, and pretty much everything else you can imagine. These little compact plants stay nice and small, which makes them perfect for enclosed spaces.

So what exactly makes them such great choices for terrariums? Well, they actually store water in their thick, fleshy leaves, so you don’t have to worry as much about overwatering them. They also really love those humid, low-light conditions that your closed terrarium naturally provides. Once you get your peperomia established in its new home, it basically runs on minimal intervention and takes care of itself.

I’d recommend trying Peperomia caperata if you want those beautiful rippled leaves, or maybe go with the trailing scandens variegata if you’re looking for some cascading greenery.

They’re pretty much bulletproof and will forgive you when you mess up. Just make sure you give them some well-draining soil, and they’ll thrive in whatever temperatures you’re already comfortable with at home.

Baby Tears: Dense Green Carpeting for Terrarium Floors

Want to create a lush green carpet on your terrarium floor? Baby Tears might be exactly what you’re looking for. This little Mediterranean plant forms an incredibly dense carpet with these tiny, round leaves that honestly make the whole setup look like something out of a fairy tale.

Baby Tears creates a magical fairy-tale carpet in terrariums with its tiny round leaves and dense Mediterranean charm.

The way it spreads horizontally is pretty impressive – it fills in all those empty spots and gives your terrarium that finished, professional appearance. It does really well in closed terrariums since it loves high humidity, and bright indirect light works perfectly for it.

You’ll want to keep the soil consistently moist but not waterlogged (think more like a damp sponge rather than a swamp). One of the nice things about it is that it’s completely pet-safe and even helps clean your indoor air a bit.

Just keep an eye on it and trim it back every now and then or it might try to take over everything, but other than that you’ll have beautiful green carpeting all year long. It’s honestly one of those plants that just keeps looking good with minimal fuss.

Maidenhair Ferns: Delicate Fronds That Love Consistent Moisture

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When you’re looking for something that looks absolutely stunning but has this whole reputation for being pretty dramatic, maidenhair ferns are definitely your answer. These delicate little beauties really do thrive in closed terrariums, where you can basically control their environment like some kind of protective plant parent.

Your maidenhair fern needs three main things if you want it to actually flourish:

1. Bright, filtered light – picture that dappled sunlight filtering through a forest canopy, not those harsh direct rays that’ll fry it
2. Consistently moist soil – never completely bone dry, never swampy either, just that perfectly damp feeling
3. High humidity that’s above 60% – your terrarium’s natural moisture becomes their absolute best friend

The real magic happens when you can maintain that perfect sweet spot of conditions. These ferns will reward all your careful attention with some of the most elegant, lacy fronds that make your terrarium look like this miniature fairy garden.

Is it worth all the fuss? I’d say absolutely.

Carpet Moss: Soft Evergreen Foundation for Natural Landscapes

If you’ve ever wanted to create that perfect “forest floor” feeling in your terrarium, carpet moss is basically like nature rolling out a green carpet just for you. This stuff makes these really dense, soft mats that will make your little miniature world look like something straight out of a fairy tale.

The best thing about carpet moss is that it’s pretty much maintenance-free once you get it established. You want to keep it moist consistently – but not soggy, that’s important. Give it some indirect light too. Don’t use tap water, go with distilled or rainwater instead.

Moss really loves high humidity so your closed terrarium works perfectly for this.

Make sure you press it down firmly onto your substrate, that way it can absorb nutrients the right way. Trim off any bits that turn yellow every once in a while and you’re good to go. It grows kind of slowly but steadily, and it creates that lush ground cover you’re probably dreaming of.

Boston Fern: Classic Choice for Stable Humid Environments

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Boston Fern: Classic Choice for Stable Humid Environments

Boston ferns have been decorating peoples homes for more than a century, and there’s definitely a good reason why they’ve managed to hang around so long – they work incredibly well in terrarium settings. These delicate, feathery plants absolutely love the steady humidity levels that you get with closed terrariums.

Your Boston fern is going to do best when you stick to these basic care tips:

1. Keep the soil moist but not wet – you’ll want to water it when about an inch of the top soil feels dry to the touch, just don’t overdo it.
2. Give it bright light, but not direct sunlight – morning light works great, but avoid those harsh afternoon sun rays.
3. Try to keep temperatures somewhere between 60-75°F – pretty much just normal room temperature.

The main thing to remember is that these plants really value consistency. Boston ferns absolutely can’t stand sudden changes in their environment, so the stable conditions inside your terrarium are basically like giving them a permanent vacation at a luxury resort.

Selaginella: Prehistoric Textures With Feathery Foliage

If you want something that’ll really bring those ancient, prehistoric vibes to your terrarium, you should definitely consider Selaginella. This little plant is basically like having your own miniature piece of an ancient forest sitting right there in your home.

The spikemoss has this really delicate, feathery texture that just makes the whole setup look incredible.

What I love about these plants is how perfectly they work in closed terrariums – its almost like they were made for that environment. They absolutely love high humidity and those warm temperatures that naturally build up inside your container.

Plus, they stay nice and small, usually around 3 to 5 inches tall, so you dont have to worry about them overwhelming everything else in there.

Care is pretty straightforward too. Just keep the soil moist (but not waterlogged, thats important) and place it somewhere with good indirect light.

Oh, and if you have pets or kids around, these are totally safe, which is always a relief when you’re bringing new plants into the house.

Bird’s Nest Fern: Bold Architectural Leaves for Focal Points

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Want to make your terrarium look like something straight out of a tropical rainforest? You should definitely consider getting a Bird’s Nest Fern. These plants are absolutely gorgeous and they create this really cool fountain-like effect with their shiny, wavy leaves that honestly makes you feel like you’re in some exotic jungle.

There’s a bunch of reasons why this fern works so well in closed terrariums:

1. It absolutely loves high humidity (anything above 40%) which is exactly what you get in an enclosed setup.
2. Does best with bright, indirect light – try placing it near east or north windows.
3. Can grow anywhere from 30-90 cm tall, so it’s perfect for medium to larger sized terrariums.

You’ll want to keep the soil moist most of the time, but don’t let it get waterlogged or anything. Also, make sure water doesn’t collect in that center part where all the fronds come together.

Oh, and if you can use filtered water instead of straight tap water, that would be ideal since these plants can be pretty sensitive to all those chemicals they put in municipal water.

The Bird’s Nest Fern really does make an amazing focal point, and once you see how it fills out your terrarium you’ll understand why so many people choose this one.

Creeping Fig: Vigorous Vine Growth for Dynamic Coverage

If you want a plant that will totally transform your terrarium into some kind of lush jungle paradise, Creeping Fig is honestly your best bet. This vigorous vine grows like it’s on a serious mission, it can quickly climb over 10 feet or trail really nicely to cover backgrounds and hardscape materials.

I think of it as natures green carpet that actually follows directions, which is pretty cool.

You can train it to climb or trail basically wherever you need coverage. The leaves are about nickel-sized when mature and they create this dense, beautiful foliage that makes your terrarium look like it was designed by a professional.

Just remember you need to prune it regularly because this enthusiastic grower will happily take over your entire setup if you don’t stay on top of it. Its kind of like having a plant with zero boundaries, but the potential is amazing when you manage it properly.

Cushion Moss: Easy-Care Moisture Retention for Beginners

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When you’re just getting into the terrarium world and looking for something that’s basically impossible to mess up, Cushion Moss is kind of like having this green backup plan that happens to look really good too.

This bouncy little plant absorbs water like crazy, and then it gradually lets it back out into your closed terrarium setup. You really can’t ask for much easier care than that.

So here’s why Cushion Moss might just become your go-to choice:

1. Great for water control – It keeps moisture levels steady on its own, which means you probably won’t end up flooding your whole terrarium by mistake.
2. Does fine without much light – You don’t need any special lighting equipment or anything, just don’t put it somewhere with really intense sunlight.
3. Super simple to get going – All you do is get it wet, squeeze the extra water out, and gently push it down onto whatever substrate you’re using.

Once it’s settled in, you’ll hardly have to spray it at all. Not a bad setup if you ask me.

Frequently Asked Questions

How Often Should I Water My Closed Terrarium Plants?

You should water your closed terrarium plants every 1-4 months, based on visual cues like absent condensation, dry soil, and drooping leaves. Don’t follow schedules, water sparingly only when needed.

Can I Mix Different Plant Species Together in One Terrarium?

Yes, you can mix different plant species in one terrarium. Choose plants with similar humidity, light, and temperature needs. Select compact varieties like ferns, mosses, and Fittonia to prevent overcrowding, and maintain proper airflow.

What Size Terrarium Container Works Best for These Plants?

Picture a cozy glass home: you’ll want 1-5 gallon containers for most tropical mixes. Compact plants thrive in smaller spaces, while trailing species need taller containers. Choose wide-mouth designs for easier planting, and maintenance.

How Do I Prevent Mold Growth in My Closed Terrarium?

You’ll prevent mold by sterilizing materials before setup, avoiding overwatering, and ensuring proper ventilation by periodically opening your terrarium. Add springtails to consume mold spores, and remove any dead plant material immediately.

When Should I Prune or Trim Overgrown Terrarium Plants?

Prune when plants crowd others versus giving them space to thrive. You’ll know it’s time when leaves yellow, growth stretches leggy, or condensation increases. Regular trimming prevents overcrowding, while maintaining your terrarium’s healthy balance.

Final Thoughts

Congratulations, youve officially become a plant parent to some of the most dramatic and high-maintenance divas you’ll find in the plant world. These terrarium plants are going to guilt trip you into maintaining perfect humidity levels, and honestly they’ll judge your watering techniques way harder than your mother-in-law critiques your cooking skills. But hey, don’t stress about it too much – once you figure out how to keep these little green prisoners content in their glass cage, you’re going to feel like some kind of botanical genius. All your friends will probably think you’re basically the Plant Whisperer or something.