Closed mossarium

You can place this terrarium under

2) Bright indirect light
(i.e. within 1metre away from window)
Pour 3 spray bottles (150ml) every 3 weeks  (Large rectangular tank)
Pour 2 spray bottles (100ml) every 3 weeks  (Small rectangular tank)
Pour 1.5 spray bottles (75ml) every 3 weeks  (Square tank)
Pour 3 tablespoons every 3 weeks  (Large egg)
Pour 1/2 spray bottle (25ml) every 3 weeks (Candy jar)

3) Medium light
Pour 3 spray bottles (150ml) every 4 weeks  (Large rectangular tank)
Pour 2 spray bottles (100ml) every 4 weeks  (Small rectangular tank)
Pour 1.5 spray bottles (75ml) every 4 weeks  (Square tank)
Pour 3 tablespoons every 4 weeks  (Large egg)
Pour 1/2 spray bottle (25ml) every 4 weeks (Candy jar)

– You have to pour water over all areas of the moss, spraying alone is insufficient. Moss should always feel lightly damp to the touch.
– Keep soil and moss lightly moist. Do not flood them. If it’s flooded, decrease the amount and/or frequency.
– Ensure there is always light condensation on the inner walls. Light fogs are normal
– Open the lid and air it overnight once a week to prevent mould growth
– Adjust according to weather conditions and temperature of location
e.g. during rainy periods, rate of evaporation is lower so decrease watering volume/frequency slightly
e.g. if your window area is warm, rate of evaporation is higher so increase watering volume/frequency slightly

Not recommended because you won’t want your plants to outgrow the glass container too quickly.

– High humidity required inside closed container to keep moss and wet plants alive
– You can spray it once a day if you wish

For square+rectangular tanks+candy jars:
Thin layer of activated charcoal
20% coco peat
20% perlite
60% potting soil

For large egg:
100% potting soil

A closed mossarium is a mini self-sustaining ecosystem. Water evaporates and condenses on the walls of the glass container, forming droplets which are absorbed by the plants. In comparison to other houseplants, closed mossariums require very little care. All you need to do is to keep the environment moist and humid, but never over-water.

Moss are plants without roots which absorb water and nutrients via their leaves in the damp and shady environments they live in.

In the wild, they live in green clumps.

Use distilled water/rainwater instead of tap water as it can prevent mineral build-up which can kill the plants.

Monitor and maintain a healthy level of moisture within the container. Droplets of water as well as light fog (see below pic) on the walls of the container are healthy and common:


If you notice the walls of the container are heavily fogged or overly moist (see below pic), there’s too much water. Over-watering can cause mould or the plants to rot. Err on the side of too little water rather than too much since there’s no where for them to drain.

When that happens, simply wipe the excess water droplets away, or open the lid to let them evaporate.

If you spot mould, simple wipe them off using a piece of tissue or cotton bud.

If you’ve achieved the right water levels, a closed mossarium can go a month or more with no water. If there’s no condensation within the jar, lightly mist the moss for the water cycle to regenerate.

Also, open the lid and air the mossarium overnight once a week to let in some fresh air.

Place the mossarium under indirect sunlight e.g. beside the window, or at a distance under your grow light 2-5 hours a day.

Do not leave it under direct sunlight for too long as the glass can magnify the heat and dry up the moss.

Moss doesn’t grow quickly. But if the moss and tall plants overgrows, simply trim them using a pair of scissors. You may also touch up using new moss if the current moss turns brown.

Remove any dead leaves or rotting plants periodically to prevent the rot from spreading.

There’s no need for fertilisers as that’ll cause the moss to grow quickly, which is something you’ll want to avoid in a closed jar.

Moss reproduces by spores. When ripen, the spore capsules break open and spores are carried by the wind.

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