Alpine Mouse-ear (Alpine Chickweed) care

Light

Most houseplants will scorch where alpine mouse-ear thrives. Give it the windowsill you'd otherwise leave empty because everything else burned there. Full sun is required, reflecting its high-alpine and Arctic native habitat. The woolly leaf indumentum is an adaptation to high UV and frost. In cultivation, site in the sunniest available position with no shade. A plant moved abruptly from low light to direct sun bleaches in 48 hours — always acclimatise over a week.

Watering

Aim for sparingly — allow soil to dry between waterings; minimal winter moisture for alpine mouse-ear, but treat that as a starting point rather than a rule. A south-facing summer windowsill will dry the pot twice as fast as a north-facing winter room. Lift the pot; if it feels noticeably lighter than it did wet, water it. Adapted to low-nutrient, low-moisture alpine environments. Water moderately during the growing season and very sparingly in winter. Winter wet is the most common cause of death in cultivation — the collar must remain dry.

Soil and pot

Alpine Mouse-ear grows best in extremely well-drained, lean, gritty alpine mix. Use a 50:50 blend of loam and coarse horticultural grit, or a purpose-made alpine compost. Fertility should be low. Acidic to neutral pH (5.5–7.0) is appropriate — unlike the related C. tomentosum, it is native to siliceous as well as calcareous substrates. 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

Alpine Mouse-ear sits happiest at around Low (20–45% RH) humidity and -40 to 18°C (-40 to 64°F). Adapted to cold, dry mountain air. High humidity at mild temperatures promotes botrytis and rot. In cultivation, an alpine house or unheated cold frame provides the dry overhead conditions the plant needs in winter. If you keep the room above 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 alpine mouse-ear sparingly. Minimal fertilisation. A very light top-dressing of alpine grit with a small amount of slow-release balanced fertiliser in spring is the most that should be applied. Over-feeding produces untypical, weak growth inconsistent with the compact alpine habit. 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 alpine mouse-ear in the Growli community. Each is annotated with the most common cause so you know where to start.

• Winter rot in wet conditions — The primary cultivation challenge. In areas with wet winters, grow under glass in an alpine house or cold frame, or ensure a gravel collar and sharp overhead drainage. A pane of glass over plants outdoors can be sufficient protection in maritime climates.
• Botrytis (grey mould) — Affects foliage in humid, still air, particularly during mild wet winters. Good air circulation and overhead dryness are preventative. Remove affected tissue immediately and improve ventilation.
• Difficulty in hot, lowland climates — Cerastium alpinum is a true arctic-alpine specialist that suffers in warm, humid lowland summers. In USDA zones above 6, it is very difficult to maintain. Cool, north-facing aspects or high-elevation gardens offer the best chance of success.

Propagation

Take 2–4 cm tip cuttings in early summer, inserting into very gritty, barely moist rooting medium. Sow seed in autumn and expose to winter cold (natural stratification is important). Division of small cushions is possible in early spring but can disturb the compact habit. Seed propagation is the most reliable method. 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

Alpine Mouse-ear is pet-safe. Cerastium alpinum is not individually listed by the ASPCA. As a member of Caryophyllaceae, the family has no documented toxic principles for dogs or cats. Generally considered non-toxic to pets at normal exposure levels. 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.

Alpine Mouse-ear deep-dive guides

Every aspect of alpine mouse-ear care, each with its own calibrated guide:

• Common alpine mouse-ear problems & fixes
• Alpine Mouse-ear watering schedule
• Alpine Mouse-ear light requirements
• Best soil mix for alpine mouse-ear
• Alpine Mouse-ear fertilizing guide
• When to repot alpine mouse-ear
• How to propagate alpine mouse-ear
• How to prune alpine mouse-ear
• What's eating my alpine mouse-ear?
• Alpine Mouse-ear growth rate & size
• Alpine Mouse-ear cold hardiness
• Alpine Mouse-ear temperature & humidity
• Is alpine mouse-ear toxic to cats & dogs?
• Is alpine mouse-ear toxic to cats?
• Is alpine mouse-ear toxic to dogs?
• Getting alpine mouse-ear to bloom

Featured in these plant shortlists

Alpine Mouse-ear 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 flowering houseplants — Indoor plants grown for their blooms — selected from the flowering species in Growli’s plant-care library.
• Best pet-safe flowering plants — Flowering houseplants the ASPCA lists as non-toxic to cats and dogs — colour and blooms in a pet home, without the worry.
• Best pet-safe plants for bright light — Non-toxic to cats and dogs and happy in a bright, sunny spot — safe plants for your best-lit windowsill.
• Best small & tabletop houseplants — Compact houseplants that stay under about 40 cm — desk, shelf and windowsill plants that never outgrow a small space.
• Best houseplants for full sun — Houseplants that want direct sun — the species for a hot south or west-facing windowsill where shade-lovers scorch.
• Best houseplants for a cool room — Houseplants that tolerate cool conditions down to about 10°C — for an unheated spare room, hallway, porch or a home kept cool.
• 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.
• Best small pet-safe plants — Compact, tabletop houseplants that are also ASPCA non-toxic to cats and dogs — safe greenery for a desk or shelf.
• Browse all 29 plant shortlists — pet-safe, low-light, drought-tolerant and more

Related guides

Alpine Mouse-ear is also commonly called Alpine Mouse-ear or Alpine Chickweed.

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