Ornamentalshrub ornamentalSome care needed

Lavender

Lavandula angustifolia

A Mediterranean sub-shrub that dies of wet feet, not of cold. English lavender is hardy enough for anywhere in Britain and still fails routinely on heavy clay, where the roots sit in cold water all winter. The other half of keeping it alive is pruning it every year without cutting into old bare wood, which does not regrow.

Position: Full sun
Water: low demand
Drainage: Free-draining
Grows to: 45–90 cm × 45–90 cm
Hardiness: H5
Flowers: June to August
Difficulty: Some care needed

Described view

A lavender bush with the correct pruning line marked in the soft green growth, and the woody base below it marked as the zone that will not reshoot

August

In flower · Prune

Coming next month: plant.

Lavender’s year

Resolved for United Kingdom (general). Every window is stored against a climate event rather than a date, so a late frost pocket runs later than the band shows. What else August calls for.

Activity	A	M	J	J	A	S
Plant	April.	May.				September.
In flower			June.	July.	August.
Prune					August.	September.

Timing that travels

The band above resolves this plant's windows into months for one region. These are the windows themselves, stored against a climate event rather than a date — which is the form that survives being carried to a colder garden, a frost pocket, or next year.

Conditions it needs

Light: Full sun
Frost: Hardy
Hardiness rating: H5 (RHS)
Grows best at: 15–28 °C
Soil: Sandy, Chalky, Loam
Soil pH: 6.5–8
Drainage: Free-draining
Water needs: low
Drought: good tolerance
Waterlogging: poor tolerance
Heat: good tolerance
Wind and exposure: good tolerance

Where these figures come from

LightSourced guidancehigh confidence

Royal Horticultural Society: Lavender — position

Checked 2026-08-13

FrostSourced guidancehigh confidence

Royal Horticultural Society: Lavender — hardiness

Checked 2026-08-13

Hardiness ratingSourced guidancemoderate confidence

Royal Horticultural Society: RHS hardiness ratings

Checked 2026-08-13

Grows best atSourced guidancemoderate confidence

Royal Horticultural Society: Lavender — temperature

Checked 2026-08-13

SoilSourced guidancemoderate confidence

Royal Horticultural Society: Lavender — soil

Checked 2026-08-13

Soil pHSourced guidancemoderate confidence

Plant Finder — Missouri Botanical Garden: Lavandula angustifolia — culture

Checked 2026-08-13

DrainageSourced guidancemoderate confidence

Royal Horticultural Society: Lavender — soil

Checked 2026-08-13

Water needsHorticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

DroughtHorticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

WaterloggingHorticultural consensusmoderate confidence

The single thing that kills established lavender in Britain. Winter wet, not winter cold.

No external citation — see the evidence type above.

Checked 2026-08-13

HeatHorticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

Wind and exposureHorticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

On your soil

Computed by comparing this plant's recorded requirements against each soil's recorded characteristics. A recorded horticultural fact overrides the comparison where GrowingHQ holds one.

Soil	Verdict	Why
Heavy clay	Struggles here	Lavender is hardy enough for anywhere in Britain and still dies routinely on clay, because what kills it is winter wet at the roots rather than cold air. The hardiness rating on the label is the figure people check and the wrong one. A raised bed or a pot of gritty compost solves it completely.
Sandy	Prefers this soil	Sandy suits Lavender as it stands: The free drainage is exactly what it wants. Sandy soil is among the soils it is recorded as suiting. It stands dry conditions better than most, which this soil will test.
Chalky and alkaline	Prefers this soil	Sharp drainage and a high pH are the conditions lavender evolved on, and chalky gardens grow it better than the loam everyone else envies. The same is true of thyme, sage and oregano — the group that is difficult everywhere else is easy here.
Loam	Prefers this soil	Loam suits Lavender as it stands: The pH suits it: it wants 6.5 to 8, and this soil is in that range. The free drainage is exactly what it wants. Loam is among the soils it is recorded as suiting. The soil holds moisture, which saves a great deal of watering.
Silty	Prefers this soil	Silty suits Lavender as it stands: The pH suits it: it wants 6.5 to 8, and this soil is in that range. The free drainage is exactly what it wants. The soil holds moisture, which saves a great deal of watering.
Peaty and acid	Works, with one condition	Lavender will crop on peaty and acid, but one thing has to be dealt with first. It needs ground that drains, and this soil holds water. A plant that stays in the ground through winter with its roots in cold, saturated soil rots — which is what kills most of what fails on heavy ground, rather than the cold.Improve the drainage before planting — a raised bed, or bulky organic matter worked in over several seasons. Do not add sand to clay in small quantities; it makes the problem worse.
Shallow over rock	Prefers this soil	Shallow over rock suits Lavender as it stands: The free drainage is exactly what it wants. Loam is among the soils it is recorded as suiting. It stands dry conditions better than most, which this soil will test.
Made ground and urban soil	Works, with one condition	Lavender will crop on made ground and urban soil, but one thing has to be dealt with first. It needs ground that drains, and this soil holds water. A plant that stays in the ground through winter with its roots in cold, saturated soil rots — which is what kills most of what fails on heavy ground, rather than the cold.Improve the drainage before planting — a raised bed, or bulky organic matter worked in over several seasons. Do not add sand to clay in small quantities; it makes the problem worse.

Not sure which you have? Four hand tests will settle it.

Space and spacing

Mature height: 45–90 cm
Mature spread: 45–90 cm
Rooting depth: 45 cm
Spacing: 45–90 cm apart

Where these figures come from

Mature heightHorticultural consensusmoderate confidence: No external citation — see the evidence type above.
Checked 2026-08-13
Mature spreadHorticultural consensusmoderate confidence: No external citation — see the evidence type above.
Checked 2026-08-13
Rooting depthHorticultural consensusmoderate confidence: No external citation — see the evidence type above.
Checked 2026-08-13
SpacingSourced guidancemoderate confidence: Royal Horticultural Society: Lavender — spacing
Checked 2026-08-13

Measured centre to centre. Plants set closer than this compete for light and water long before they look crowded, and the crowding cannot be undone once they are in.

In a container

Minimum volume: 10 litres or more
Minimum depth: 25 cm

Where the container figures come from

Minimum volumeHorticultural consensusmoderate confidence: No external citation — see the evidence type above.
Checked 2026-08-13
Minimum depthHorticultural consensusmoderate confidence: No external citation — see the evidence type above.
Checked 2026-08-13

The reliable way to grow it on clay: a pot of gritty compost gives the drainage the ground cannot.

Habit and ultimate size

What the plant becomes, rather than what it is when you buy it. The gap between the two is where most planting mistakes live.

Foliage: Evergreen
In a container: Good in a container long-term

Where these figures come from

FoliageSourced guidancehigh confidence: Royal Horticultural Society: Lavandula angustifolia — foliage
Checked 2026-08-13
In a containerHorticultural consensusmoderate confidence: No external citation — see the evidence type above.
Checked 2026-08-13

Growth rate: Moderate — roughly 30–60 cm a year
Ultimate height: 45–90 cm
Ultimate spread: 45–90 cm
Time to reach it: 3–5 yearsSourced guidance

Where these figures come from

Growth rateSourced guidancemoderate confidence: Royal Horticultural Society: Lavandula angustifolia — growth rate
Checked 2026-08-13
Ultimate heightSourced guidancemoderate confidence: Royal Horticultural Society: Lavandula angustifolia — ultimate height
Checked 2026-08-13
Ultimate spreadSourced guidancemoderate confidence: Royal Horticultural Society: Lavandula angustifolia — ultimate spread
Checked 2026-08-13
Time to reach itSourced guidancelow confidence: Royal Horticultural Society: Lavandula angustifolia — time to ultimate size
Checked 2026-08-13

Cutting it back. Will not regrow from bare wood, which is the whole of what there is to know about pruning it. Trim into the current season's growth every year after flowering; a plant allowed to go leggy and woody cannot be brought back and is replaced.

source

Horticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

Where and how you can grow it

Each way of growing is assessed separately, and “not assessed” is a real answer rather than a gap we have filled in with a guess.

Method	Suitability	What it needs
Open ground	Well suited source Sourced guidancemoderate confidence Royal Horticultural Society: Growing method suitability Checked 2026-08-13	On free-draining ground. Marginal to poor on heavy clay.
Traditional dug bed	Well suited source Sourced guidancemoderate confidence Royal Horticultural Society: Growing method suitability Checked 2026-08-13
Raised bed	Well suited source Sourced guidancemoderate confidence Royal Horticultural Society: Growing method suitability Checked 2026-08-13	The best option on clay, for drainage rather than for soil quality.
Container	Well suited source Sourced guidancemoderate confidence Royal Horticultural Society: Growing method suitability Checked 2026-08-13	10 litres; Gritty free-draining compost
Greenhouse	Workable source Sourced guidancemoderate confidence Agriculture and Horticulture Development Board — AHDB: Protected cropping Checked 2026-08-13
Polytunnel	Workable source Sourced guidancemoderate confidence Agriculture and Horticulture Development Board — AHDB: Protected cropping Checked 2026-08-13
Windowsill	Marginal source Horticultural consensusmoderate confidence Royal Horticultural Society: Growing herbs and salads indoors Checked 2026-08-13
Hydroponics	Not suitable source Sourced guidancemoderate confidence Royal Horticultural Society: Growing method suitability Checked 2026-08-13

Growing it

PruningCut back by about a third straight after flowering, staying within the soft green growth. Lavender does not reshoot from old bare wood, so a plant cut back into the woody base is not rejuvenated — it is finished. A leggy old plant is replaced rather than reclaimed.
PlantingPlant on a slight mound or a raised bed on heavy soil, and add grit to the planting hole rather than compost. Organic matter holds water, which is the opposite of what lavender needs.
WateringWater a newly planted lavender through its first summer whenever there is a genuinely dry fortnight, and then stop for good — an established plant in open ground should never be watered in Britain, and the commonest way a good lavender is spoiled is kindness in July. What kills them here is not drought but winter wet: cold, sodden, heavy soil around the crown, which is why they are so much better on a slope, a raised bed or a gravelly bank than in a well-worked border. Plants in pots do need watering, but on the soak-then-dry cycle rather than little and often, and they must never stand in a saucer. A lavender going grey and woody at the base with dieback in the middle is nearly always a drainage story.
FeedingDo not feed lavender. This is the clearest case in the shrub border of conditions making the plant: on thin, poor, sharply drained soil it stays compact, silver, heavily scented and lives for years, and the same plant on fed ground grows lax and green, flops open from the centre, carries less oil and dies younger. A plant in a pot is the only qualification, and even there the answer is fresh loam-based compost with grit every second or third spring rather than fertiliser. If an established lavender is growing poorly the cause is shade, wet feet or age, and none of the three is fixed by feeding.

Where this guidance comes from

PruningSourced guidancehigh confidence: Royal Horticultural Society: Lavender — pruning
Checked 2026-08-13
PlantingSourced guidancehigh confidence: Royal Horticultural Society: Lavender — planting
Checked 2026-08-13
WateringSourced guidancehigh confidence: Royal Horticultural Society: Lavender — cultivation
Checked 2026-08-13
FeedingSourced guidancehigh confidence: Royal Horticultural Society: Lavender — cultivation
Checked 2026-08-13

The bud you cut to becomes the new shoot, and it grows in the direction it points — which is why an outward-facing bud opens the plant up and an inward-facing one crosses the middle.

Is it worth putting under cover?

Whether it will grow there is on the methods table above. This is whether the space is well spent, which is a different question and usually the one being asked.

Structure	What protection is worth	What decides it
Greenhouse	Worse under cover source GrowingHQ editorial positionmoderate confidence What protection is worth for this crop, judged against the same standard as every other record in this file. GrowingHQ editorial synthesis — GrowingHQ Checked 2026-08-13	Winter humidity. Lavender is the plant most often killed by kindness in this catalogue, and a closed house in winter is the most concentrated form of it.
Polytunnel	Worse under cover source GrowingHQ editorial positionmoderate confidence What protection is worth for this crop, judged against the same standard as every other record in this file. GrowingHQ editorial synthesis — GrowingHQ Checked 2026-08-13	Winter humidity.

On a windowsill

Does not work indoors

source

GrowingHQ editorial positionmoderate confidence

How long the crop is actually productive on an ordinary British windowsill without added light.

GrowingHQ editorial synthesis — GrowingHQ

Checked 2026-08-13

Not a windowsill crop. The reason is given — usually light, root volume or sheer size. Light and airflow. Lavender indoors goes grey, leggy and mildewed within a season; it is a plant for the sunniest driest place outside.

What goes wrong

Problem	How often	Notes
Spittlebug	common source Horticultural consensusmoderate confidence No external citation — see the evidence type above. Checked 2026-08-13	Cuckoo spit in the leaf joints from late May. Harmless.
Rosemary beetle	common source Horticultural consensusmoderate confidence No external citation — see the evidence type above. Checked 2026-08-13	Adults and grubs strip the foliage and flower spikes from late summer onward.
Aphids	uncommon source Horticultural consensusmoderate confidence No external citation — see the evidence type above. Checked 2026-08-13

Sources for this page

Agriculture and Horticulture Development Board · GrowingHQ editorial synthesis · Plant Finder · Royal Horticultural Society

Each figure on this page carries its own citation, under the “where these figures come from” note in its section. Record last reviewed 2026-08-14.