Haworth's Lampranthus (Purple Brightfig) care

Light

Most houseplants will scorch where haworth's lampranthus thrives. Give it the windowsill you'd otherwise leave empty because everything else burned there. Demands full sun throughout the day. Flowers are notably large (up to 70 mm diameter) and only open fully in bright, direct sunshine. In cooler climates, a south-facing, sheltered wall position maximises light exposure and extends the flowering season. A plant moved abruptly from low light to direct sun bleaches in 48 hours — always acclimatise over a week.

Watering

Aim for every 2–3 weeks in the growing season; sparingly in summer dormancy for haworth's lampranthus, 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. Drought-tolerant; swollen, water-storing leaves buffer the plant through prolonged dry spells. Water deeply and allow soil to dry completely between waterings. As a winter-rainfall species, it may appreciate modest water in autumn and winter but should be kept nearly dry in summer.

Soil and pot

Haworth's Lampranthus grows best in sandy, well-drained loam or gritty compost. Prefers light, lean soils with rapid drainage. Tolerates rocky and sandy substrates. A top-dress of coarse river sand around the stem base helps prevent crown rot. Avoid waterlogged or clay-rich soils. Plant on a slope or raised bed where possible to improve drainage. 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

Haworth's Lampranthus sits happiest at around Low, 20–45% RH humidity and 3–35°C (37–95°F). Native to the Western Cape and Karoo. Tolerates dry conditions well. Avoid high humidity combined with cool temperatures, which can promote botrytis and stem rot. Ensure ventilation when grown under glass. If you keep the room above 3–35°C 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 haworth's lampranthus sparingly. Feed once in late autumn (the start of its growing season) with a low-nitrogen, high-potassium fertiliser. A second light feed in late winter supports flowering. Avoid overfeeding, which causes excess leafy 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 haworth's lampranthus in the Growli community. Each is annotated with the most common cause so you know where to start.

• Root and crown rot — Most commonly triggered by poorly draining soil or overwatering during summer dormancy. Remove affected roots, dust with sulphur fungicide, and repot or replant in well-draining gritty compost with improved drainage.
• Frost kill — Not reliably frost-hardy. Temperatures consistently below 0°C damage or kill the plant. In the UK, grow in a container that can be brought indoors before first frost, or take cuttings each summer as insurance.
• Woody, unproductive growth — Older plants become woody at the base and produce fewer flowers. Cut back by one-third after flowering in spring to stimulate new vegetative growth. Take cuttings from vigorous young shoots to rejuvenate the planting.

Propagation

Take 10–12 cm tip cuttings in spring or autumn from healthy new growth. Allow cut ends to callous for 2 days, then insert into free-draining gritty compost. Keep barely moist until rooted (3–5 weeks). Seed can be sown in spring or autumn at 18–22°C; viable seed germinates within 3–5 days under ideal conditions; cover seed no more than 1 mm deep. 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

Haworth's Lampranthus is mildly toxic to pets. Lampranthus haworthii is not individually listed by the ASPCA. The genus belongs to Aizoaceae, a family with no well-documented systemic toxin, but ingestion of plant material may cause mild gastrointestinal upset in pets. Treat with caution around cats and dogs. 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.

Haworth's Lampranthus deep-dive guides

Every aspect of haworth's lampranthus care, each with its own calibrated guide:

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

Featured in these plant shortlists

Haworth's Lampranthus qualifies for 5 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

• 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 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 fast-growing houseplants — Houseplants documented as fast or vigorous growers — quick to fill a pot, cover a pole or trail down a shelf.
• Browse all 29 plant shortlists — pet-safe, low-light, drought-tolerant and more

Related guides

Haworth's Lampranthus is also known as Haworth's Lampranthus, Purple Brightfig, and Haworth's Ice Plant.

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