Sempervivum 'Black' (Black Houseleek) care

Light

Aim for at least 4-6 hours of direct sun on the leaves. Full, direct sun is essential for the dark, near-black colour and compact rosettes; 6+ hours. In shade it reverts to plain green and the rosettes loosen. If your only bright window faces south, that's perfect for sempervivum 'black' — same window any aroid would fry on.

Watering

Watering sempervivum 'black': when soil is fully dry, every 10-14 days in growth; very little in winter. 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. Drought-tolerant. Soak then let dry completely, watering at soil level to keep the rosette centre dry. Overwatering and wet soil are the main causes of rot.

Soil and pot

Sempervivum 'Black' grows best in gritty, sharply draining succulent/alpine mix. Succulent compost with abundant grit, perlite or coarse sand, or a gravelly alpine blend. Excellent drainage is critical; heavy soil retains water and rots the crown. 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

Sempervivum 'Black' sits happiest at around 30-50% humidity and -20 to 28°C (-4 to 82°F). Prefers dry, airy conditions like other houseleeks. High humidity with stagnant air or moisture in the rosette promotes fungal and crown rot. 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 sempervivum 'black' sparingly. Rarely needed. Lean soil intensifies the dark colour; feeding produces soft green growth. At most one very dilute feed in spring. 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 sempervivum 'black' in the Growli community. Each is annotated with the most common cause so you know where to start.

• Colour reverting to green — Too little light. The dark, near-black pigment is sun- and cold-driven and fades fast in low light or warmth.
• Crown and root rot — Overwatering or poor drainage. Use gritty soil, water at the base, and let it dry fully between waterings.
• Parent rosette flowering then dying — Natural monocarpic behaviour. Cut out the spent rosette; offsets carry the colony on.
• Etiolation in pots indoors — Stretched, pale rosettes from insufficient sun. Move outdoors or to the brightest window.

Propagation

Easy. Separate rooted offsets and replant into gritty mix; they establish fast. Divide clumps in spring or summer; named hybrids are propagated vegetatively, not from seed, to stay true. 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

Sempervivum 'Black' is pet-safe. ASPCA-listed as non-toxic to cats, dogs and horses (Sempervivum / hens and chickens). A pet-safe genus; chewing may at most cause mild, short-lived stomach upset. 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.

Sempervivum 'Black' deep-dive guides

Every aspect of sempervivum 'black' care, each with its own calibrated guide:

• Sempervivum 'Black' watering schedule
• Sempervivum 'Black' light requirements
• Best soil mix for sempervivum 'black'
• Sempervivum 'Black' fertilizing guide
• When to repot sempervivum 'black'
• How to propagate sempervivum 'black'
• Sempervivum 'Black' growth rate & size
• Sempervivum 'Black' cold hardiness
• Sempervivum 'Black' temperature & humidity
• Is sempervivum 'black' toxic to cats & dogs?
• Is sempervivum 'black' toxic to cats?
• Is sempervivum 'black' toxic to dogs?

Featured in these plant shortlists

Sempervivum 'Black' 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 drought-tolerant houseplants — Houseplants that prefer to dry out — forgiving of forgotten watering and ideal for travel or busy weeks.
• 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 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

Sempervivum 'Black' is also commonly called Black Houseleek.

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• All 1284 plant care guides in the Growli library