Soil & potting mix
Best soil for Cushion Moss Selaginella (Selaginella martensii)
Also called Martens Spikemoss, Trailing Selaginella, Variegated Selaginella.
More about cushion moss selaginella
About Cushion Moss Selaginella
Selaginella martensii · also called Martens Spikemoss, Trailing Selaginella · houseplant
Selaginella martensii is a popular terrarium and houseplant spikemoss from Mexico and Central America, known for its arching, branching stems and bright green foliage — variegated cultivars also exist. It performs best in high humidity. No known toxicity; not listed by ASPCA as harmful.
Preferred mix: Moist, humus-rich, free-draining mix
Watch for — Root rot: Over-watering or poor drainage quickly leads to rot. Ensure containers drain freely and do not allow the pot to sit in standing water.
Why cushion moss selaginella needs this mix
Cushion Moss Selaginella is an easy-going houseplant — it just wants a free-draining general mix that holds some moisture but never stays soggy.
- Cushion Moss Selaginella is adaptable, but like most houseplants it still needs air at the roots — a mix that drains freely while holding a working moisture reserve.
- A little perlite or bark stops ordinary compost compacting into an airless block over time, which is the slow, common cause of decline.
- It is not fussy about pH or special ingredients; getting the air-to-moisture balance right is what matters.
For the full picture on what makes up a good mix, see our guide to the main types of soil and potting media — it explains why each ingredient above behaves the way it does.
What goes wrong with the wrong mix
The wrong soil is one of the most common reasons cushion moss selaginella struggles, and the damage often shows up weeks later as a watering problem. For this species specifically:
- Plain garden soil or a cheap, claggy compost compacts in the pot and slowly suffocates cushion moss selaginella's roots.
- A pure peat mix that dries to a hard, water-repelling block is hard to re-wet and stresses the plant.
- No drainage hole turns even a good mix into a stagnant, root-rotting sump.
Reusing tired, compacted old compost or skipping the perlite. A free-draining mix in a pot with a hole solves most "why is it struggling" cases for cushion moss selaginella.
pH — does it matter for cushion moss selaginella?
Cushion Moss Selaginella is not fussy about pH — a slightly acidic to neutral mix (around pH 6.0-7.0), which a standard peat-free compost provides, is perfectly fine. No testing needed.
If you want to check or adjust it, the soil pH guide walks through testing and the safe ways to nudge a mix more acidic or more alkaline.
DIY mix vs a bagged one
A decent bagged houseplant compost works for cushion moss selaginella as long as you mix in perlite for air. The simple DIY ratio above is cheap and more reliable than a budget bag alone.
Drainage and the pot
A pot with a drainage hole and a saucer you empty after watering is all cushion moss selaginella needs — the free-draining mix does the rest.
Refresh cushion moss selaginella's mix every 18-24 months; even good compost slumps and compacts, and fresh, airy mix is often the simplest fix for a tired plant. When the time comes, our repotting guide for cushion moss selaginella covers the timing and technique step by step.
Cushion Moss Selaginella soil — frequently asked questions
What is the best soil mix for cushion moss selaginella?
3 parts peat-free houseplant compost : 1 part perlite : 1 part orchid bark or coco chips (optional). Cushion Moss Selaginella is adaptable, but like most houseplants it still needs air at the roots — a mix that drains freely while holding a working moisture reserve.
Can I use normal potting soil for cushion moss selaginella?
Plain garden soil or a cheap, claggy compost compacts in the pot and slowly suffocates cushion moss selaginella's roots. A decent bagged houseplant compost works for cushion moss selaginella as long as you mix in perlite for air. The simple DIY ratio above is cheap and more reliable than a budget bag alone.
Does cushion moss selaginella need a special pH?
Cushion Moss Selaginella is not fussy about pH — a slightly acidic to neutral mix (around pH 6.0-7.0), which a standard peat-free compost provides, is perfectly fine. No testing needed.
Should I buy a bagged mix or make my own for cushion moss selaginella?
A decent bagged houseplant compost works for cushion moss selaginella as long as you mix in perlite for air. The simple DIY ratio above is cheap and more reliable than a budget bag alone.
How often should I refresh the soil for cushion moss selaginella?
Refresh cushion moss selaginella's mix every 18-24 months; even good compost slumps and compacts, and fresh, airy mix is often the simplest fix for a tired plant. A pot with a drainage hole and a saucer you empty after watering is all cushion moss selaginella needs — the free-draining mix does the rest.
Keep reading
- Cushion Moss Selaginella care — the full brief (light, water, humidity, problems, pet safety)
- How often to water cushion moss selaginella — the schedule the mix feeds into
- Repotting cushion moss selaginella — when and how to refresh the mix
- Soil pH guide — test it and adjust it safely
- Should I water my plant? The simple check first
- Overwatered plant — signs and recovery
- Root rot — how the wrong soil starts it, and how to save the plant
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