Cotton Lavender (Lavender Cotton) care

Light

Cotton Lavender needs sun on the leaves, not just bright ambient room light. Requires full sun to maintain the compact, mounded shape and the vivid silver-grey colour; shaded plants become loose and floppy and develop less fragrance. A south or west-facing windowsill in the northern hemisphere is the default; anywhere else, expect the plant to stretch and pale out within a season.

Watering

Water cotton lavender every 2–4 weeks once established; minimal in winter. The actual day count varies with pot size, light, and season — the finger test (or lifting the pot to feel its weight) is more reliable than a fixed calendar. Empty any drainage saucer afterwards so the pot isn't sitting in water. Extremely drought-tolerant once established. Suffers more from excess moisture than drought; water only when the soil is dry and never allow the roots to sit in standing water.

Soil and pot

Cotton Lavender grows best in poor to moderately fertile, sharply drained, neutral to alkaline. Sandy, rocky, or gritty soils are ideal; add horticultural grit to clay soils. Rich, fertile soil produces excessive soft growth and increases disease susceptibility. 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

Cotton Lavender sits happiest at around Low (30–50 %) humidity and -15 °C to 35 °C (5 °F to 95 °F). Thrives in dry, well-ventilated conditions typical of Mediterranean hillsides. High humidity with poor airflow encourages botrytis and stem dieback. 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 cotton lavender sparingly. Feed sparingly with a low-nitrogen slow-release granule in spring only; regular feeding or rich soil reduces hardiness and compactness. 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 cotton lavender in the Growli community. Each is annotated with the most common cause so you know where to start.

• Woody, open centre after several years — Plants become woody and open in the middle without annual pruning. Cut back hard to within a few centimetres of old wood immediately after flowering to maintain a dense, compact mound.
• Root rot in wet or clay soil — Wet winters or poorly drained soil rapidly cause root and crown decay, especially in cold weather. Plant in raised beds or on slopes with added grit, and avoid autumn fertilisation.

Propagation

Take semi-ripe cuttings in mid-summer and root in gritty compost; rooting is usually rapid. Can also be raised from seed sown under glass in late winter at 15 °C, though cultivars do not come true from seed. 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

Cotton Lavender is mildly toxic to pets. Santolina chamaecyparissus does not appear on the ASPCA formal Toxic Plant list, but it is not confirmed non-toxic either. Its essential oil contains camphor and linalool — compounds known to be irritating or toxic to cats and dogs in concentrated form. Garden-plant ingestion is unlikely to cause serious harm, but gastrointestinal upset is possible. Classified as mildly-toxic; consult a vet if a pet ingests significant quantities. 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.

Cotton Lavender deep-dive guides

Every aspect of cotton lavender care, each with its own calibrated guide:

• Common cotton lavender problems & fixes
• Cotton Lavender watering schedule
• Cotton Lavender light requirements
• Best soil mix for cotton lavender
• Cotton Lavender fertilizing guide
• When to repot cotton lavender
• How to propagate cotton lavender
• How to prune cotton lavender
• What's eating my cotton lavender?
• Cotton Lavender growth rate & size
• Cotton Lavender cold hardiness
• Cotton Lavender temperature & humidity
• Is cotton lavender toxic to cats & dogs?
• Is cotton lavender toxic to cats?
• Is cotton lavender toxic to dogs?
• All 9 Santolina varieties

Featured in these plant shortlists

Cotton Lavender qualifies for 1 curated Growli shortlist — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

• Best fragrant houseplants — Indoor plants with scented flowers or aromatic foliage — greenery you can smell, selected from our care library.
• Browse all 29 plant shortlists — pet-safe, low-light, drought-tolerant and more

Related guides

Cotton Lavender is also known as Cotton Lavender, Lavender Cotton, and Santolina.

• Mediterranean Sage care — light, water and common problems
• Common Wormwood care — light, water and common problems
• Green Cotton Lavender care — light, water and common problems
• All 10153 plant care guides in the Growli library