How to Make a Moss Terrarium (DIY Mossarium): Step-by-Step

Moss is a much-loved staple ingredient for closed terrariums.

There’s something about its bouncy, verdant nature that effortlessly gives texture and depth to any design.

Whether it’s to create an effect of rolling hills, dense jungle, or a wild grassland – there’s a different kind of moss to suit each occasion. And we have our favorites.

Now, the mossarium puts moss at the heart of a design (and with a little ingenuity and proper care), we can create something truly captivating.

Today, I’ll teach you how to make your own magnificent mossarium.

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Moss doesn’t get nearly the same amount of attention as your standard terrarium plants. 

Sure, moss is generally easy to care for and low maintenance, but shouldn’t that be rewarded with a little extra love?

So, we’re going to kick this thing off by looking at the kinds of terrarium mosses you can expect to find and use for your mossarium. 

It’s, of course, not an extensive list (there are around 12,000 species of moss, after all), and many others would suit too. But it’s a great starting point for some of the best and most available types.

*Also, avoiding preserved moss for your mossarium project is advisable. It will likely contain dyes and chemicals that can leech and damage any living material. 

Either go all in on the live moss or all in on the preserved.

1 | Cushion Moss (Leucobryum glaucum)

The term ‘Cushion Moss’ is by far one of the most widely searched mosses on the internet. 

Though many types of moss are often conflated within this term, it generally refers to the species Leucobryum glaucum – most commonly found across North America and Europe.

Its green leaves are distinctly formed to create a puffy pillow shape.

This shape makes it an infinitely popular choice for use in terrariums to create the effect of hillsides and shrubbery.

👉 Shop Cushion Moss on Etsy.

2 | Fern Moss (Thuidium delicatulum)

This is the moss I see in the wild more than any other.

Found in Europe, Japan, and North America – Fern moss enjoys a more neutral PH environment. It typically grows up tree trunks, on rock surfaces, and along the forest floor.

There are a few very similar mosses in the Thuidium classification, and they’re easily mistaken for one another.

It’s a great choice of moss to create a miniature fern-forest aesthetic (hence the common name Fern Moss).

That being said, they all enjoy similar environments, and this isn’t a botany master’s – so let’s move on.

👉 Shop Fern Moss on Etsy.

3 | Mood Moss (Dicranum scoparium)

One of my personal favorites, Mood Moss, is another acrocarpous moss (clumpy) and one of the more sought-after variants.

Dicranum scoparium, also known as Rock Cap Moss, produces thick, wavy green tufts of up to 10cm in height.

I enjoy this moss not only for its vibrancy but for the fact its fluffy bushiness can carpet a wide area without having to use too much.

It’s native to North America but can be found across Europe, also.

👉 Shop Mood Moss on Etsy.

4 | Hypnum Moss (Hypnum cupressiforme and Hypnum imponens)

Hypnum Moss is incredibly common, though that doesn’t mean it’s not a valuable member of the moss community.

Found in every continent except Antarctica, it grows within a wide variety of conditions.

Be it on trees, deadwood, rock faces, or the soil – it’s hard to miss. However, it does tend to prefer acidic soils – as most mosses do.

I don’t think it shines in a mossarium compared to some of the other options above, but if you can get your hands on something high quality, it can create an organic feel to your design.

👉 Shop Hypnum Moss on Etsy.

The time has come… let’s do this thing!

1 | Grab Your Glassware & Give it a Clean

Your choice of container will set the tone for your whole design.

Because moss quickly dries out in an open environment, the first and only rule is that the glass container either needs a lid or a very narrow entry – so that humidity is easily retained.

You want to start with a blank slate, so wash, rinse, and dry your container thoroughly before you begin.

2 | Add Substrate

Getting a good terrarium substrate mix isn’t nearly as important for moss as with other closed terrarium plants.

As they enjoy remaining moist, aeration and drainage aren’t as imperative.

(Though if you really want to push the boat out, most mosses prefer acidic and dense, clay-based soil).

I’ve always used moss inside my terrariums with various substrates, and the moss has never suffered as a result. Any decent tropical substrate mix will do the job nicely.

I would recommend including some activated charcoal within your substrate to bind any harmful chemicals that may pass through the water.

👉 Shop activated charcoal here.

You don’t need a ton of substrate to provide for your moss – simply enough to attach to.

3 | Hardscape

Now, hardscape is technically optional, but aesthetically, I’d say it’s essential.

A visually complex piece of stone or driftwood can add some serious flavor to a mossarium scene.

From a design perspective, I like to place the largest elements at the back of the terrarium, with smaller pieces cascading into the foreground, allowing for maximum visibility within your design.

But it’s up to you.

*For a more advanced mossarium setup, why not consider using Lava Rock in tandem with an aquatic moss, like Java Moss? The incredibly porous nature of Lava Rock can, over time, allow such mosses to grow all over the stone itself.

4 | Building the Scene

After you’re happy with your hardscape placement, sculpt your substrate into desired areas.

Then, gently mist the substrate to dampen it adequately. It’s important not to do this before you’re happy with the landscape – otherwise, it’ll get stuck to the glass and make more clean-up work afterward.

5 | Prepare Your Moss

The star of the show!

Before you use your moss, make sure it’s been hydrated and/or cleaned.

To do this, place it in a bowl of water and soak for 10 minutes until any stowaway critters have come to the surface (if fresh) or for 30 minutes until thoroughly moist (if dried).

A final point is that the rhizoids may be present with some kinds of moss.

With Cushion or Mood Moss, for example, there’s a thick layer of brown rhizoid underneath the vivid green tufts.

You can trim this away before placement.

6 | Place Your Moss

Now it’s time for the good bit!

You don’t need anything fancy, but for any mossarium or terrarium build, having some terrarium tools to hand can be useful. 

When placing your moss, gently push it into the soil or hardscape. Moss doesn’t have roots, so you needn’t worry so much about the depth of placement.

If you’re placing pieces of moss with rhizomes near the outside of your mossarium, I’d recommend trying to ‘tuck’ the brown bit inwards so that you’re not left with a dull layer permeating around the circumference of your wonderful design.

7 | Finishing Touches

Now, the fundamental design of your mossarium is complete; a paintbrush can help you clean down the interior sides of your glassware.

Now is also the time to choose whether there are any other elements you’d like to include.

I have the habit of over-adding finer details, but a few good highlights rarely go amiss.

This may be a few branches of spiderwood twisting throughout the rock face or some bright pebbles or seashells at the shoreline of a sandy beach.

8 | Adding Microfauna

Custodial critters like springtails can be a wonderful way to turn your mossarium bioactive.

These bioactive terrarium insects are detritivores that consume decaying organic matter or mycelial growth and convert it back into nutrients within your substrate.

Once all other elements are added, you can add in your springtails and turn your mossarium bioactive.

They will arrive in a container, but a good extraction method is to pour a little water inside their container, gently swish it around to gather springtails into a pool, and then pour them into your mossarium design.

👉 Grab a Springtail Culture here from our store.

9 | Spray it Down with Water

Even though moss is partial to a fair quantity of H20, you must still be conscious of overwatering.

What kind of water you use can matter, though.

Some, but not all, tap waters contain high levels of chemicals such as chlorine. Such chemicals can be detrimental to the development of your fluffy friends and turn them brown.

Because of this, it’s recommended to use filtered or purified water.

I’ve found tap water to suit a variety of mosses I’ve used, but some certainly are a tad more on the sensitive side.

• Watering – a sealed container should be able to maintain a humid environment and water cycle. However, if your moss begins to dry out at any point, you can mist your vessel with a spray bottle from time to time to boost humidity and moisture.
• Lighting – mosses still require light for photosynthesis to produce food, but too much light will dry out your moss. Keep your mossarium in a relatively shaded area that doesn’t get blasted with direct sunlight regularly – bright indirect sunlight is ideal here.

• Heating – much like with light, you must be careful not to overheat your mossarium. Keep it away from artificial heat sources like radiators and electrical appliances, and do not let it ‘cook’ in the sun. Remember, the glass will act like a greenhouse. 
• Maintenance – if your moss completely takes off and grows exponentially, hooray! You may wish to simply let it do its thing, or you might want to keep it in check to maintain your special design. A long, thin pair of scissors will allow you to trim any unwanted excess. 

And the best part is that you can repurpose these cuttings in another design… Infinite moss, anyone?

Whew, so there we go. That was a big ‘un. But I think I’ve covered everything.

What do you think? Is there a particular type of moss you love to use that isn’t mentioned?

Let me know down below – I always love to hear your thoughts.