There is something wonderfully satisfying about creating an entire green landscape inside a glass container. A moss terrarium can be a tiny forest, a peaceful desktop garden or a miniature world populated with stones, plants and curious little inhabitants.
Better still, you don’t need to be an experienced gardener to make one.
This beginner-friendly guide explains how to make a moss terrarium, what you’ll need and how to keep your miniature landscape looking fresh and healthy.
WHAT YOU’LL NEED TO MAKE A MOSS TERRARIUM
Before you begin, gather the following:
• A clean glass container
• A drainage layer such as LECA clay pebbles or small gravel
• Activated charcoal
• Suitable terrarium substrate
• Fresh live moss
• A fine-mist water sprayer
• Long tweezers or a small spoon
• Stones, bark or miniature decorations, if desired
A container with a lid is ideal for creating a humid, closed moss terrarium. An open glass container can also work, although it will usually need more frequent misting.
If you would prefer everything gathered together for you, explore our moss terrarium kits for an easy starting point.
Already have a jar you want to use? Our DIY Terrarium Starter Kit contains the drainage, charcoal, sphagnum and soil layers for this guide—everything but the jar.
STEP 1: CLEAN YOUR CONTAINER
Begin with a clean glass vessel. Wash it with warm water, rinse it thoroughly and allow it to dry.
A clean container gives you a clear view of your miniature landscape and reduces the chance of unwanted mould or residue being introduced at the beginning.
Avoid using strongly scented cleaning products. If you do use washing-up liquid, make sure the glass is rinsed extremely well.
STEP 2: CREATE A DRAINAGE LAYER
Cover the bottom of the container with a shallow layer of LECA clay pebbles, gravel or small stones.
Terrariums do not normally have drainage holes, so this lower layer provides somewhere for excess water to collect. It helps prevent the substrate—and the moss sitting above it—from remaining permanently waterlogged.
The layer doesn’t need to be enormous. In a small terrarium, one or two centimetres will usually be enough.
STEP 3: ADD ACTIVATED CHARCOAL
Add a thin layer of activated charcoal above the drainage material.
Activated charcoal can help keep a closed terrarium environment fresher by absorbing some impurities and odours. It doesn’t replace careful watering, but it is a useful addition to a small enclosed ecosystem.
You can place it directly over the drainage layer or separate the layers with a small piece of fine mesh.
STEP 4: ADD YOUR SUBSTRATE
Add enough substrate to create the shape of your landscape.
You don’t have to make it perfectly flat. Gentle slopes, raised areas and small valleys can make a terrarium look much more natural and interesting.
Firm the substrate lightly with your fingers or the back of a spoon, but don’t compress it into a hard layer. Moss enjoys consistent moisture, so the substrate should be able to hold some water without becoming saturated.
STEP 5: PREPARE YOUR LIVE MOSS
Fresh moss may look slightly compressed after travelling in its packaging. Remove it carefully, spread it out and give it a light mist before planting.
Inspect the underside and gently remove any loose leaves, twigs or excess soil that you don’t want inside your terrarium. Moss is naturally variable, so differences in colour, shape and texture are completely normal.
Our collection of live moss for terrariums includes soft feather-style woodland mosses as well as rounded cushion moss, also known as bun moss. Not sure how much to order? Our moss size guide matches quantities to container widths.
STEP 6: POSITION THE MOSS
Now comes the enjoyable part: creating your miniature landscape.
Place larger pieces first and gently press the underside of the moss against the damp substrate. Long terrarium tweezers are helpful for positioning smaller pieces or reaching into narrow containers.
Feather moss works beautifully as spreading ground cover. Its branching texture creates a soft woodland-floor effect and can be arranged around plants, stones and other features.
Cushion or bun moss naturally forms rounded mounds. Use it to create miniature hills, add height or provide a strong focal point.
You can also combine both varieties for a richer, more varied landscape. Read our cushion moss vs feather moss guide if you would like help choosing between them.
STEP 7: ADD THE FINISHING DETAILS
Once the moss is positioned, add any stones, pieces of bark or miniature decorations.
Try not to overcrowd the container. Leaving a little open space makes individual moss shapes easier to appreciate and gives the finished terrarium a more convincing sense of scale.
A tiny brass frog, miniature Buddha or unusual natural object can give your mossarium a little personality—but the moss should remain the star.
STEP 8: GIVE IT A LIGHT MIST
Mist the finished terrarium lightly with clean water. A fine-mist mini mister makes it much easier to stop before things get soggy.
The aim is to make the moss and substrate moist, not soaking wet. Water should not be pooling heavily in the drainage layer.
Rainwater or distilled water is particularly useful in hard-water areas because it reduces the mineral marks that can build up on glass and moss.
If your container has a lid, put it in place after you have finished.
Want a festive version? Our guide to making a Christmas terrarium with live moss uses these same layers with winter-proof decorations.
WHERE TO PUT YOUR MOSS TERRARIUM
Place your terrarium somewhere with bright, indirect or diffused light.
Avoid strong direct sunlight. Glass containers can heat up surprisingly quickly, and excessive heat can dry or damage living moss.
A bright shelf, desk or table away from a hot window is often ideal. Keep the terrarium away from radiators and other direct sources of heat.
HOW OFTEN SHOULD YOU MIST A MOSS TERRARIUM?
There is no single watering schedule that suits every terrarium. The size of the container, type of lid, room temperature and amount of light all affect how quickly it loses moisture.
In a closed terrarium, the moisture should recycle naturally. Some light condensation is normal. If the glass remains heavily covered with water throughout the day, remove the lid briefly to allow excess moisture to escape.
If the moss begins to look dry and there is no condensation, add a small amount of water with a fine mister.
Open terrariums lose moisture more quickly and will normally need misting more often. Check the moss regularly rather than watering automatically. Our live moss care guide covers watering, light and ventilation in more detail.
COMMON MOSS TERRARIUM MISTAKES
USING TOO MUCH WATER
More water does not mean healthier moss. Permanently saturated substrate can encourage mould and deterioration. Begin with a light mist—you can always add more later.
PLACING IT IN DIRECT SUNLIGHT
A sunny windowsill may look appealing, but it can turn a closed glass container into a tiny greenhouse very quickly. Choose bright, indirect light instead.
USING AN UNCLEAN CONTAINER
Residue, old soil and decaying plant material can introduce unnecessary problems. Start with clean glass and fresh materials.
EXPECTING EVERY PIECE OF MOSS TO LOOK IDENTICAL
Living moss changes with the seasons and its growing conditions. Colour, density, texture and shape will naturally vary. That variation is part of the pleasure of creating with something genuinely alive.
ADDING TOO MANY DECORATIONS
It is easy to fill every gap, but a little restraint usually produces a more natural-looking landscape. Give your moss room to be seen.
CAN MOSS LIVE IN A CLOSED TERRARIUM?
Yes. Moss is particularly well suited to the humid environment inside a closed terrarium.
The key is balance: consistent moisture, indirect light and no excessive heat. A closed terrarium should need relatively little attention once it has settled, but it is still worth observing it and making small adjustments when necessary. Curious why? Here's how a closed terrarium waters itself.
DOES TERRARIUM MOSS NEED SOIL?
Moss doesn’t take up nutrients through roots in the same way as conventional houseplants. However, a suitable substrate helps retain moisture and provides a stable surface against which the moss can sit.
Moss can also be arranged over stones, bark and other natural materials, provided it receives enough humidity and moisture.
WHAT IS THE BEST MOSS FOR A TERRARIUM?
Choose feather moss when you want soft, spreading coverage and a natural woodland-floor texture.
Choose cushion or bun moss when you want distinctive rounded forms, miniature hills and areas of height.
Use both when you want the greatest variety of shape and texture.
MORE QUESTIONS ABOUT MAKING A MOSS TERRARIUM
What kind of jar can I use?
Almost any clear glass container: a Kilner or preserving jar, a sweet jar, a cloche, a fishbowl or a vase. Clear glass matters more than shape, because tinted glass cuts the light the moss needs. For a first build, choose an opening at least wide enough to fit a spoon comfortably. Plastic works in a pinch, but it scratches and clouds over time.
Planting a narrow-necked bottle or demijohn instead? Our guide to making a bottle garden covers the tools and tricks for getting everything through the neck.
How deep should each layer be?
A useful rule of thumb for a small jar: 1–3cm of drainage, a thin scatter of charcoal, and 3–5cm of substrate. Keep all the layers together to roughly a third of the jar’s height at most, so the landscape rather than the geology is the view.
What soil should I use?
A light, free-draining mix rather than garden soil, which compacts, can stay soggy and often carries pests. Peat-free houseplant compost loosened with a little fine bark or coir works well, as does a ready-made terrarium substrate. Avoid composts heavy with added fertiliser: moss doesn’t need it, and extra nutrients encourage algae and mould.
Can I skip the charcoal or the drainage layer?
In a closed jar with no drainage holes, keep the drainage layer: it’s your safety margin against overwatering. Charcoal is more optional. It’s cheap insurance against stale smells in a sealed jar, but a small open mossarium will usually do fine without it.
Should I add springtails?
You don’t have to, but they help. Springtails are tiny, harmless soil creatures that graze on mould and decaying matter, and many closed-terrarium builders add a small culture as a clean-up crew. They’re sold by reptile and bioactive suppliers.
Can I seal the lid straight away?
Yes. Just expect the first two to four weeks to be a settling-in period. Condensation may swing about and a little white fuzz can appear as the system finds its balance. Watch the glass, air it out if it stays streaming wet, and resist the urge to keep adding water.
Can I use moss from my garden or a walk?
Moss from your own garden can work, but it often brings in slugs, insects and weed seeds, and it may not suit life under glass. In the UK it’s also an offence to uproot wild plants, moss included, without the landowner’s permission. Our guide to where to buy live moss in the UK explains what to look for instead.
BUILD YOUR OWN LITTLE GREEN WORLD
A moss terrarium doesn’t need to be complicated or perfectly planned. Begin with a clean container, build a simple drainage layer and let the natural shapes of the moss guide your design.
Explore our fresh live moss and DIY terrarium kits, carefully prepared and packed by The Moss Fairy in Bristol.
Small worlds. Big green happiness. 🌿