Cushion Moss Selaginella (Martens Spikemoss) care

Light

The Goldilocks zone. Not the south-facing windowsill (too hot, too direct), not the back of the room (too dim, growth stalls). Thrives in medium indirect light such as a bright but shaded north or east windowsill. Tolerates lower light than most houseplants but grows more vigorously with adequate brightness. Avoid direct sun. If you can't decide, a free phone lux-meter app aimed at the leaf at noon should read between 800 and 1,500 lux.

Watering

Watering cushion moss selaginella: keep soil consistently moist, watering every 4-6 days before the surface dries. The number that matters isn't the day of the week — it's how dry the top 2-3 cm of the pot feels. A finger in the soil tells you more than a watering app. After every watering, tip the saucer. Selaginella martensii wilts rapidly when under-watered but also rots if waterlogged. Aim for evenly moist soil and use a well-draining container. Bottom-watering suits this species well.

Soil and pot

Cushion Moss Selaginella grows best in moist, humus-rich, free-draining mix. A blend of coir, fine composted bark, and perlite provides the balance of moisture retention and aeration this species needs. pH 5.5–6.5 is appropriate. A pot with a working drainage hole is non-negotiable for this species — even free-draining mix will turn soggy in a closed planter. If you love the look of a decorative pot without a hole, use it as a cachepot around an inner nursery pot you can lift out to water.

Humidity and temperature

Cushion Moss Selaginella sits happiest at around 65-85% humidity and 15-25°C (59-77°F). Needs above-average humidity. A closed or semi-open terrarium is ideal. Outside a terrarium, place on a pebble tray with water and mist daily to maintain the humid microclimate it needs. If you keep the room above 15 year-round and avoid placing the plant near a cold draught, a hot radiator, or an air-conditioning vent, you have already handled the two biggest indoor stressors.

Fertilising

Feed cushion moss selaginella sparingly. Apply a balanced liquid fertiliser at quarter strength once a month during spring and summer. Feed sparingly — Selaginella has modest nutritional needs and excess fertiliser causes burnt tips. Skip fertiliser entirely on a stressed, recently-repotted, or actively wilting plant — fertiliser salts make damage worse, not better. Wait for a round of healthy new growth before resuming a feeding rhythm.

Common problems

Below are the issues we see most often on cushion moss selaginella in the Growli community. Each is annotated with the most common cause so you know where to start.

• Leaf browning from low humidity — The primary issue in centrally heated homes. Move to a terrarium or increase misting and place near a humidifier.
• 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.
• Leggy stems — Caused by insufficient light. Trim back long stems to encourage bushier growth and provide slightly brighter indirect light.
• Spider mites — Occasionally appear in dry conditions. Increase humidity and treat with insecticidal soap if needed.

Companion plants

Cushion Moss Selaginella pairs well with Fittonia, Peperomia, Miniature orchids, and Begonia. These are species with similar light and water needs, so you can group them in the same room or on the same shelf and water as a batch.

Propagation

Take stem cuttings 5-8 cm long and press them onto moist coir in a humid propagator. Roots develop within 2-4 weeks. Clump division is equally reliable and can be done at any time. Propagation is the cheapest, most satisfying way to expand a collection — and it doubles as insurance against losing a mature plant to an accident. Take a backup cutting once the parent is established and healthy.

Toxicity to pets

Cushion Moss Selaginella is pet-safe. Selaginella martensii is not individually listed by the ASPCA as toxic to cats or dogs. No toxic compounds have been identified in this or related Selaginella species, and it is broadly regarded as pet-safe. If you keep cats, dogs, or curious children in the house, weigh placement carefully — a high shelf or a hanging planter is enough for casual safety. For severe ingestion incidents, call your local vet and the ASPCA Animal Poison Control Center (in the US, 888-426-4435).

Pet-safety status is sourced from the ASPCA Toxic and Non-Toxic Plant List, which catalogues the most-asked-about plants for cats, dogs, and horses.

Cushion Moss Selaginella deep-dive guides

Every aspect of cushion moss selaginella care, each with its own calibrated guide:

• Common cushion moss selaginella problems & fixes
• Cushion Moss Selaginella watering schedule
• Cushion Moss Selaginella light requirements
• Best soil mix for cushion moss selaginella
• Cushion Moss Selaginella fertilizing guide
• When to repot cushion moss selaginella
• How to propagate cushion moss selaginella
• How to prune cushion moss selaginella
• What's eating my cushion moss selaginella?
• Cushion Moss Selaginella growth rate & size
• Cushion Moss Selaginella cold hardiness
• Cushion Moss Selaginella temperature & humidity
• Is cushion moss selaginella toxic to cats & dogs?
• Is cushion moss selaginella toxic to cats?
• Is cushion moss selaginella toxic to dogs?
• All 11 Selaginella varieties

Featured in these plant shortlists

Cushion Moss Selaginella qualifies for 10 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

• Best pet-safe houseplants — Houseplants the ASPCA lists as non-toxic to cats and dogs — every one verified against the ASPCA toxic and non-toxic plant list.
• Best low-light houseplants — Houseplants that need no direct sun and cope with a north-facing room or a spot well back from a window.
• Best plants for a north-facing window — Houseplants for a north-facing window: bright, even, indirect light and no scorching direct sun. Each pick verified against its documented light needs.
• Best pet-safe low-light plants — Non-toxic to cats and dogs AND happy with no direct sun — the two hardest constraints to satisfy at once.
• Best humidity-loving houseplants — Houseplants that thrive in a bathroom, kitchen, or by a humidifier — selected by documented humidity preference.
• Best bathroom plants — Humidity-loving houseplants that also cope with lower light — suited to the steamy, often-dim conditions of a typical bathroom.
• Best pet-safe bathroom plants — Non-toxic to cats and dogs and happy in the humid, lower-light conditions of a bathroom — safe greenery for the smallest room.
• Best pet-safe bedroom plants — Non-toxic to cats and dogs and happy in lower light — calming greenery for a bedroom where a pet often sleeps too.
• Best cat-safe plants — Houseplants the ASPCA lists as non-toxic to cats (and dogs) — safe greenery for a home with a curious cat.
• Best dog-safe plants — Houseplants the ASPCA lists as non-toxic to dogs (and cats) — safe greenery for a home with a curious dog.
• Browse all 30 plant shortlists — pet-safe, low-light, drought-tolerant and more

Related guides

Cushion Moss Selaginella is also known as Martens Spikemoss, Trailing Selaginella, and Variegated Selaginella.

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