Cushion Draba (Brunii-leaved Whitlow Grass) care

Light

Aim for at least 4-6 hours of direct sun on the leaves. Full sun is essential. This mountain species demands maximum light to maintain its characteristic tight cushion form. Even partial shade leads to loose, weak growth and sparse flowering. If your only bright window faces south, that's perfect for cushion draba — same window any aroid would fry on.

Watering

Watering cushion draba: sparingly; soil must dry between waterings. 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. Very drought-tolerant. Water moderately in spring during active growth; keep almost dry in winter. Standing moisture at the crown, particularly in cold wet winters, is the primary killer. Use a gravel mulch around the base to shed rain.

Soil and pot

Cushion Draba grows best in very sharply draining alpine scree mix. Best in a 60:40 mix of coarse horticultural grit to loam-based compost, or pure scree composed of limestone or granite chippings with minimal organic matter. Neutral to slightly alkaline pH (6.5–7.5). Avoid rich, moisture-retentive composts entirely. 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 Draba sits happiest at around Low, 20–40% RH humidity and -20°C to 20°C (-4°F to 68°F). Adapted to the low humidity and excellent air circulation of high-altitude mountain ridges. Stagnant, moist air encourages botrytis and cushion rot. Grow in fully open, unobstructed positions. 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 cushion draba sparingly. No regular feeding needed. An optional light top-dressing of grit mixed with a very small amount of slow-release alpine fertiliser in early spring can support flowering without promoting lush, rot-susceptible growth. 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 draba in the Growli community. Each is annotated with the most common cause so you know where to start.

• Cushion rot in wet winters — Persistently wet conditions cause fungal rot at the centre of the cushion, which collapses and browns. Improve drainage, apply a gravel collar, and consider growing in an alpine house or covered frame through the wettest months.
• Vine weevil grubs — Larvae can attack roots in container-grown plants, causing sudden collapse. Check roots when repotting and apply biological nematode controls (Steinernema kraussei) in late summer or early autumn.
• Etiolation in low light — Any shade causes the cushion to lose density and become open and straggly. There is no remedy short of moving the plant to a fully open, sunny position and allowing it to grow back into form over one to two seasons.

Propagation

Take small rosette cuttings in early summer, insert into pure gritty cutting compost, and root in a cool frame with good ventilation. Seed sown fresh in autumn in a cold frame germinates in spring after natural cold conditioning. Division of established clumps in spring after flowering is also effective. 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 Draba is pet-safe. Draba bruniifolia is not individually listed by ASPCA. The genus Draba belongs to Brassicaceae, a family with no documented toxic principles. No toxicity to dogs, cats, or horses has been reported in horticultural or veterinary literature. 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 Draba deep-dive guides

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

• Common cushion draba problems & fixes
• Cushion Draba watering schedule
• Cushion Draba light requirements
• Best soil mix for cushion draba
• Cushion Draba fertilizing guide
• When to repot cushion draba
• How to propagate cushion draba
• How to prune cushion draba
• What's eating my cushion draba?
• Cushion Draba growth rate & size
• Cushion Draba cold hardiness
• Cushion Draba temperature & humidity
• Is cushion draba toxic to cats & dogs?
• Is cushion draba toxic to cats?
• Is cushion draba toxic to dogs?
• All 6 Draba varieties
• Getting cushion draba to bloom

Featured in these plant shortlists

Cushion Draba qualifies for 11 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 drought-tolerant houseplants — Houseplants that prefer to dry out — forgiving of forgotten watering and ideal for travel or busy weeks.
• Best flowering houseplants — Indoor plants grown for their blooms — selected from the flowering species in Growli’s plant-care library.
• Best pet-safe low-maintenance plants — Non-toxic to cats and dogs and forgiving of forgotten watering — the easiest safe choices for a busy pet household.
• 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 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

Cushion Draba is also commonly called Cushion Draba or Brunii-leaved Whitlow Grass.

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• All 8452 plant care guides in the Growli library