Lavender care

Light

Lavender is a sun-lover and needs the brightest spot in the home to thrive. 6+ hours of direct sun for strong flowering and oil content. Indoors that almost always means a south or west-facing windowsill in the northern hemisphere. Plants moved abruptly from low light to direct sun will scorch — acclimate them over 7-10 days by giving a little more sun each day.

Watering

Water lavender when the top of the soil is dry, every 10-14 days. The actual day count varies with pot size, light level, and the season — the finger test (or, better, lifting the pot to feel its weight) is more reliable than a calendar. Empty any drainage saucer after watering so the pot is never sitting in water. Drought-tolerant once established. Established plants rarely need irrigation outside of severe drought.

Soil and pot

Lavender grows best in lean, free-draining alkaline soil. pH 6.7-7.5. Grit or sand cuts heavy soils; raised beds suit it. 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

Lavender sits happiest at around 30-50% (outdoor) humidity and 13-27°C (55-80°F). Prefers dry air; humid summers encourage fungal disease. If you keep the room above 13 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 lavender sparingly. Almost none; lean soil produces strong scent. A spring top-dress with compost is plenty. 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 lavender in the Growli community. Each is annotated with the most common cause so you know where to start.

• Woody bare base — Hard pruning into old wood does not regrow — replace every 5-7 years.
• Browning after winter — Wet feet; lavender hates winter wet more than cold.
• No flowers — Insufficient sun or over-fertilising producing leaf at the expense of bloom.
• Lavender shab — Fungal disease causing branch dieback; cut out and dispose.

Companion plants

Lavender pairs well with Rose, Rosemary, Sage, and Thyme. These are species with similar light and water needs, so you can group them in the same room or on the same shelf and water as a batch.

Propagation

Softwood cuttings in summer root in 4-6 weeks under a humidity dome. 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

Lavender is mildly toxic to pets. ASPCA lists lavender as toxic to cats, dogs, and horses due to linalool and linalyl acetate. Garden nibbles are low risk; concentrated essential oils and large ingestions cause vomiting and GI 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.

Lavender deep-dive guides

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

• Lavender watering schedule
• Lavender light requirements
• Best soil mix for lavender
• Lavender fertilizing guide
• When to repot lavender
• How to propagate lavender
• Lavender growth rate & size
• Lavender cold hardiness
• Lavender temperature & humidity
• Is lavender toxic to cats & dogs?
• Getting lavender to bloom

Related guides

Lavender is also known as English lavender, true lavender, and common lavender.

• Peace lily care — light, water and common problems
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• All 200 plant care guides in the Growli library