Lavender is the plant that makes a garden smell like a holiday: grey-green mounds topped with purple spikes that hum with bees all summer. It is a Mediterranean shrub, built for sun, poor soil and drought, and it rewards neglect far more than fuss.
Grow it for cut flowers, dried bundles for drawers, cooking and homemade oils — and as a low hedge along a sunny path, where brushing past it releases the scent. One established plant gives armfuls of stems every year. This crop is in the Lamiaceae family, needs full sun, and takes 90–120 days to reach maturity, so it pays to know what it wants before you sow. This guide covers it all: starting seeds, transplanting, soil and feeding, watering, sunlight, pests, companion plants, harvesting and the problems most likely to catch you out. Prune in late summer after flowering, shaping the plant into a low mound and taking off the spent flower stems plus an inch or two of green growth. Never cut into the bare woody stems at the base — they seldom regrow.
Lavender at a glance
| Growing factor | What lavender need |
|---|---|
| Sun | full sun |
| Soil pH | 6.5–7.5 |
| Days to germination | 14–28 |
| Days to maturity | 90–120 |
| Spacing | 18–24 inches |
| Water needs | low |
| Cold tolerance | hardy |
| Family | Lamiaceae |
Starting seeds
Lavender are started indoors and moved outside as seedlings. Sow in trays or cells, keep the mix moist but not wet, and expect germination in 14–28 days. Give seedlings strong light from the moment they emerge — a grow light a few inches above the leaves is worth having.
Start seed early enough that seedlings are sturdy by planting-out time, but not so early that they go leggy indoors. Work backwards from your last frost using our seed-starting calculator, and confirm the timing with your local extension service — Zones 11–13 are frost-free, so the calendar there is about heat and rain rather than frost.
Lavender seed is slow to germinate, taking 14–28 days, and it needs light — press the seed onto the surface of the mix rather than burying it deep, keep it warm, and be patient. Many gardeners buy young plants instead, since seed-grown lavender can take a full season to size up.
Transplanting and planting out
Set young plants out once the soil is workable, or after the last frost where the plant is tender. Handle the root ball gently, plant at the same depth as in the pot, and water in well.
Space plants 18–24 inches apart — crowding is one of the commonest causes of small harvests. Our plant-spacing calculator works out how many plants fit your bed. Harden seedlings off for a week before planting out, and plant on a cloudy day or in the evening so they do not wilt in their first hours outdoors.
Soil and feeding
Herbs mostly want lean, free-draining soil rather than rich ground — too much fertiliser makes soft, leggy growth with weak flavour. Dig in a little compost for structure and make sure water drains away freely, especially in winter.
Aim for a soil pH of 6.5–7.5 — a simple soil test will tell you where you stand. Feed lightly and steadily rather than in one heavy dose: too much fast nitrogen late in the season pushes leafy growth at the expense of the part you eat. Our fertiliser calculator works out amounts for your bed size, and the raised-bed soil calculator tells you how much mix a new bed needs.
Watering
Water needs are low, so this crop is more forgiving of a missed watering than most. Water deeply but infrequently, letting the soil dry a little between waterings, and avoid keeping the foliage wet.
Herbs in pots dry out faster than herbs in the ground, so check pots daily in hot weather. In the ground, most herbs are happy with a deep watering when the soil dries out rather than a daily sprinkle.
Water at the base of the plant, in the morning, so the leaves dry quickly. Our watering calculator gives a starting point for your bed size, and the watering schedule generator can build a routine around it.
Sunlight and temperature
Give herbs the sunniest spot you have — a south-facing bed, or a pot on a sunny step. Full sun keeps growth compact and flavour concentrated; in shade, most herbs grow leggy and taste weak.
This crop is rated hardy for cold tolerance, so plan your season around that: hardy crops can be sown and harvested around frosts, while tender crops need warm soil and frost-free nights. Our sunlight calculator can check whether your spot gets enough sun, and the hardiness-zone finder will confirm your zone.
Pests and diseases
Lavender are not especially pest-prone when healthy and well placed, but a few pests turn up regularly. The ones listed for this crop in the growing data are aphids, spider mites, whiteflies.
- Aphids — Small sap-sucking insects that cluster on soft new shoots, weakening growth. A strong jet of water dislodges them, and ladybirds usually keep them in check.
- Spider Mites — Tiny mites that thrive in hot, dry conditions, leaving fine webbing and speckled, bronzed leaves. Keep plants watered and remove badly affected leaves.
- Whiteflies — Small white flies that gather on leaf undersides and fly up in a cloud when disturbed. Yellow sticky traps help monitor them, and good airflow keeps numbers down.
Inspect plants weekly, especially the undersides of leaves, and act early. If you need help identifying what you are seeing, our pest-identifier helper and plant-disease checker walk through the symptoms.
Companion plants
Companion planting puts together plants that help each other — sharing space well, attracting pollinators, or confusing pests. The companions listed for lavender in the growing data are a good starting point.
Good companions for lavender include:
- Tomatoes
- Peppers
- Marigolds
- Cabbage
Our companion-planting finder can suggest more pairings for your bed plan.
Harvesting
Cut stems in the morning, just as the first buds on a spike are opening and the rest are still tight — that is when the scent is strongest. Gather them in small bunches, hang them upside down in a dark, airy place, and strip the dried buds into jars once they feel crisp.
Expect the crop to be ready about 90–120 days after sowing, though weather and variety shift that window by a week or two either way. Our harvest-date calculator works out your expected harvest date from your sowing date, and the vegetable-yield estimator can estimate how much a bed should produce. Harvest in the morning, using a sharp knife or secateurs rather than tearing, which damages the plant.
Common problems and fixes
| Problem | Likely cause | Fix |
|---|---|---|
| Root rot in wet soil | soil staying wet around the roots | improve drainage, water only when dry, and mulch with gravel instead of bark |
| Yellow, wilting leaves despite wet soil | overwatering — the roots are drowning | let the soil dry out between waterings and improve drainage |
| Aphids on the plants | aphids feeding on the crop | inspect weekly and act early — hand-pick, wash off, or use barriers |
Root rot in wet soil
Likely cause: soil staying wet around the roots. Root rot from wet soil is the classic lavender killer: the plant yellows from the base, wilts despite wet soil and then collapses. The fix is prevention — drainage, gravel mulch and watering only when the soil is dry.
Yellow, wilting leaves despite wet soil
Likely cause: overwatering — the roots are drowning. Low-water plants are killed by kindness more often than by drought. If leaves yellow and wilt while the soil is wet, the roots are rotting: stop watering and let the soil dry out.
Aphids on the plants
Likely cause: aphids feeding on the crop. Small sap-sucking insects that cluster on soft new shoots, weakening growth. A strong jet of water dislodges them, and ladybirds usually keep them in check.
Frequently asked questions
How long does lavender take to germinate?
14–28 days, in warm, moist conditions. Cool soil slows germination down, so wait for the soil to warm up and keep the seedbed evenly moist — not wet — until seedlings appear.
What soil pH does lavender need?
A soil pH of 6.5–7.5 suits lavender best. A simple soil test will tell you where your soil stands, and lime or sulfur can nudge pH up or down over a season.
When can I harvest lavender?
About 90–120 days after sowing, though weather and variety shift that by a week or two. For nursery-grown plants the wait is shorter than for seed.
Why is my lavender going woody and bare in the middle?
Lavender naturally gets woody with age, and it gets worse if it is never pruned or if it is fed and watered too generously, which makes soft growth that flops. Prune lightly every year after flowering, keep it in full sun and lean soil, and replace plants that have become mostly bare wood — they rarely recover.