Plant care
Red Sheep Laurel (Sheep Laurel) care
Kalmia angustifolia f. rubra
Also called Red Sheep Laurel, Sheep Laurel, Lambkill, Wicky.
Watering rhythm
Bright indirect light (just back from a sunny window)
Moderate; keep moist
Light
Bright indirect light (just back from a sunny window)
Soil
Moist, acidic, peaty or loamy
Humidity
Moderate to high
Temp
-40 to 30 °C
Pet safety
Toxic to pets
Mature size
0.5–1 m (20–36 in) tall and spreading to 1–2 m (3–6 ft) wide over time via rhizomes.
Care at a glance
Light
In the wild red sheep laurel grows on the bright edge of a forest canopy, not in the canopy and not in the open. Indoors, that translates to within a metre of an unobstructed window, sheer curtain optional. Best flowering occurs in full sun to light partial shade; in hot, dry climates provide afternoon shade to prevent scorching, but too much shade reduces flower production significantly. The fastest test: a hand held at the leaf casts a soft-edged shadow at noon — sharp shadow means too much sun, no shadow means too little light.
Watering
Aim for moderate; keep moist for red sheep laurel, 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. Prefers consistently moist, acidic soil; tolerates seasonally wet conditions and boggy edges but performs best where moisture is reliable. Not drought-tolerant once established in dry soils.
Soil and pot
Red Sheep Laurel grows best in moist, acidic, peaty or loamy. Grows naturally in acidic peat or sandy loam soils at pH 4.5–5.5; incorporate ericaceous compost at planting and mulch annually with pine needles or bark to maintain acidity. 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
Red Sheep Laurel sits happiest at around Moderate to high humidity and -40 to 30 °C (-40 to 86 °F). Adapted to cool, humid northeastern North American climates; tolerates average garden humidity but dislikes hot, dry continental summers. 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 red sheep laurel sparingly. Apply a granular ericaceous fertiliser lightly in early spring; this is a naturally nutrient-frugal plant of poor acid soils — heavy feeding causes lush, weak 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 red sheep laurel in the Growli community. Each is annotated with the most common cause so you know where to start.
- Unwanted rhizome spread — Forms dense thickets via spreading underground rhizomes that can crowd out neighbouring plants; install a root barrier at planting or remove suckers regularly at the soil surface.
- Lace bugs (Corythucha species) — Cause stippled, silvery discolouration of leaves with dark spots of excrement on the undersides; plants in full sun are most susceptible. Treat with insecticidal soap or neem oil and improve soil moisture to reduce plant stress.
Propagation
Semi-ripe cuttings under mist in summer; natural spread by rhizomes provides easy division in spring. Seed can be sown on the surface of damp ericaceous compost but germination is slow. 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
Red Sheep Laurel is toxic to pets. All parts contain grayanotoxins; the entire Kalmia genus is toxic to dogs, cats, and horses. The common name 'lambkill' reflects historical livestock deaths from grazing. Symptoms include salivation, vomiting, diarrhoea, weakness, cardiovascular arrhythmias, paralysis, and death in severe cases. 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.
Red Sheep Laurel care — frequently asked questions
What is the common name for Kalmia angustifolia f. rubra?
Kalmia angustifolia f. rubra is most commonly called Red Sheep Laurel, but it is also known as Red Sheep Laurel, Sheep Laurel, Lambkill, Wicky. The names refer to the same species, so care instructions for Red Sheep Laurel apply identically to anything sold as Sheep Laurel.
How much light does red sheep laurel need?
Red Sheep Laurel grows best in bright indirect light (just back from a sunny window). Best flowering occurs in full sun to light partial shade; in hot, dry climates provide afternoon shade to prevent scorching, but too much shade reduces flower production significantly.
How often should I water red sheep laurel?
Water red sheep laurel moderate; keep moist. Prefers consistently moist, acidic soil; tolerates seasonally wet conditions and boggy edges but performs best where moisture is reliable. Not drought-tolerant once established in dry soils. The finger-test (or lifting the pot to feel its weight) beats a fixed weekly calendar because pot size, light, and season all change how fast the soil dries.
Is red sheep laurel toxic to cats and dogs?
Red Sheep Laurel is toxic to pets. All parts contain grayanotoxins; the entire Kalmia genus is toxic to dogs, cats, and horses. The common name 'lambkill' reflects historical livestock deaths from grazing. Symptoms include salivation, vomiting, diarrhoea, weakness, cardiovascular arrhythmias, paralysis, and death in severe cases.
What USDA hardiness zone does red sheep laurel grow in?
Red Sheep Laurel is rated for USDA zone 2-6 and RHS hardiness H5. Outside that range, grow it as a container plant that overwinters indoors before the first hard frost.
Red Sheep Laurel deep-dive guides
Every aspect of red sheep laurel care, each with its own calibrated guide:
- Common red sheep laurel problems & fixes
- Red Sheep Laurel watering schedule
- Red Sheep Laurel light requirements
- Best soil mix for red sheep laurel
- Red Sheep Laurel fertilizing guide
- When to repot red sheep laurel
- How to propagate red sheep laurel
- How to prune red sheep laurel
- What's eating my red sheep laurel?
- Red Sheep Laurel growth rate & size
- Red Sheep Laurel cold hardiness
- Red Sheep Laurel temperature & humidity
- Is red sheep laurel toxic to cats & dogs?
- Is red sheep laurel toxic to cats?
- Is red sheep laurel toxic to dogs?
- All 8 Kalmia varieties
- Getting red sheep laurel to bloom
Featured in these plant shortlists
Red Sheep Laurel qualifies for 5 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:
- 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 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.
- Houseplants toxic to cats & dogs — The common houseplants the ASPCA lists as toxic to cats and dogs — the ones to keep out of reach, each with its symptoms and a safe alternative.
- 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.
- Browse all 29 plant shortlists — pet-safe, low-light, drought-tolerant and more
Related guides
Red Sheep Laurel is also known as Red Sheep Laurel, Sheep Laurel, Lambkill, and Wicky.