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Lavender

Lavandula angustifolia (English lavender) and Lavandula x intermedia (lavandin)

FlowerHerbPerennialPollinator Medium

Mediterranean and built for neglect. Lavender's real killers are wet soil and kindness — give it sharp drainage, lean soil, full sun, and a yearly prune into green growth, never bare old wood.

Growing conditions

Light
Full sun — at least 6 to 8 hours of direct sun per day; more is better. Lavender flowers poorly and grows leggy in any shade.
Water
Low
Soil
Lean, gritty, sharply drained soil — light sand, gravel, or loam of low to moderate fertility. Standing water in winter kills it, so heavy clay must be amended with grit or coarse sand, or the plant set on a raised mound or in a raised bed with gravel. · pH Alkaline-leaning, roughly 6.5–7.5 (neutral to slightly alkaline); it tolerates mildly alkaline soil better than most herbs and dislikes acidic ground. A handful of garden lime can sweeten an acidic site.
When to sow
Set transplants out in spring after the last hard frost, once soil has warmed; this gives roots a full season to establish before winter. Seed indoors can be started 8–12 weeks before the last frost. Avoid fall planting in cold zones — young plants heave and rot over a wet winter.
Spacing
30–45 cm (12–18 in) between plants; large lavandins want 60–90 cm (24–36 in). Wide spacing and airflow matter — crowded plants stay damp and rot.
Days to maturity
A nursery transplant flowers its first or second summer and reaches full size in 2–3 years. From seed it is slow: germination takes about 14–28 days (often after cold stratification) and plants typically don't bloom until their second year.
Hardiness
By species: English lavender (L. angustifolia) is the hardiest, reliable in USDA zones 5–9 with sharp drainage; lavandin (L. x intermedia, e.g. 'Grosso', 'Provence') is zones 5–9 but less reliably hardy than English — give it a sheltered spot and winter protection at the cold edge; 'Phenomenal' is the toughest lavandin (sometimes zone 4). Spanish/French lavender (L. stoechas) is tender, zones 7/8–10, and grown as an annual or overwintered indoors farther north.

How to grow it

  1. 1

    Plant high, in lean soil and full sun

    Pick the sunniest, best-drained spot you have. Lavender wants sharp drainage and low fertility — the opposite of pampering. Don't dig in rich or manure; instead work coarse sand or fine gravel into heavy soil, and on clay set the plant on a slight mound or in a raised bed so water runs away from the crown. off a greenhouse-grown plant for a few days before you it, and set it at the same depth it grew in the pot.

  2. 2

    Mulch with gravel, not moist organic matter

    lavender with pea gravel, crushed stone, or coarse sand rather than bark, straw, or . A 2–5 cm (1–2 in) gravel mulch keeps the crown dry, reflects heat, and discourages the root and crown rot that wet organic mulch invites. This single choice is one of the biggest differences between a lavender that thrives and one that rots — especially in humid summers.

  3. 3

    Water deeply but sparingly — then back off

    Water a new plant enough to settle the roots and keep it from drying out its first season. Once established, lavender is genuinely drought tolerant and wants to dry out between drinks — deep, infrequent watering beats frequent sips, and soggy soil is the fastest way to kill it. Water at the base in the morning so foliage dries by night. In most US gardens an established plant needs little or no supplemental water beyond rainfall.

  4. 4

    Feed almost nothing

    Lavender evolved on poor Mediterranean hillsides and resents being fed. Rich soil and push soft, floppy growth, fewer flowers, and weaker fragrance. Skip the and high-nitrogen feed entirely, or give at most a very light feeding in spring on truly impoverished soil. Lean and hungry is exactly how lavender likes it.

  5. 5

    Prune every year — into green, never bare old wood

    lavender once a year to keep it dense and stop it from splitting open and going woody. Wait until you see new green growth pushing from the base in spring, then cut back by about a third, always stopping above green leaves — lavender will not resprout from bare old wood, so cutting into the leafless gray stems can kill that branch or the whole plant. A light shaping after bloom is also fine.

  6. 6

    Deadhead, harvest, and let pollinators in

    Cut or spent flower spikes to keep the plant tidy and, on some types, coax a second flush. The flowers are magnets for bees and butterflies, so lavender earns its place as a near vegetables and roses. When you want more plants, from softwood cuttings taken from non-flowering green shoots in late spring to early summer — they root in a few weeks and come true to the parent, unlike seed.

Gardener's notes

  • The you choose can decide whether the plant lives: gravel or stone keeps the crown dry, while the cozy bark or mulch that helps most garden plants traps moisture against lavender's base and invites rot.
  • You can't rejuvenate a woody old lavender by cutting it hard — it won't resprout from bare gray wood. a little every year into green growth instead, and when a plant finally goes woody, start a fresh one from a softwood cutting rather than trying to save it.
  • In the US, lavender's real enemy is usually winter wet and summer humidity, not cold itself — improving drainage and airflow often does more for survival than worrying about your hardiness zone, and many UK growing guides assume a cooler, drier-summered climate, so their timing won't match yours.

Varieties worth knowing

L. angustifolia 'Hidcote'
Compact English lavender with deep violet flowers and gray foliage; cold-hardy (zone 5), one of the most reliable garden lavenders.
L. angustifolia 'Munstead'
Classic, early-blooming English lavender, compact and hardy; good for edging and culinary use.
L. x intermedia 'Grosso'
Vigorous lavandin (a sterile L. angustifolia x L. latifolia hybrid) grown commercially for oil; long stems, big fragrant spikes, blooms later than English. Sets no viable seed — propagate by cuttings.
L. x intermedia 'Phenomenal'
The toughest lavandin — bred for cold and humidity tolerance and resistance to root and foliar disease; the safest big lavender for zone 4–5 and humid regions.
L. stoechas (Spanish lavender)
Distinctive 'rabbit-ear' bracts atop the flower spike; ornamental and early but tender (zones 7/8–10) — grow as an annual or overwinter indoors in cold climates.

Common problems & fixes

Root and crown rot (Phytophthora and other water molds)
Sign: Stems wilt, gray foliage yellows or browns, and the woody crown blackens or collapses; the plant declines and dies, often after a wet spell or in heavy soil.
Fix: This is the number-one killer of lavender and it's a drainage problem, not a spray problem. Prevent it: plant in sharp-draining or raised soil, mulch with gravel instead of moist organic matter, water sparingly, and give plants room for airflow. There's no good cure once the crown rots — remove badly affected plants and don't replant lavender in the same wet spot.
Woodiness and splitting from missed pruning
Sign: Old plants flop open from the center, the base becomes a mass of bare gray stems, and flowering shrinks to the outer tips.
Fix: Prune lightly but every single year, cutting back into green growth before the plant gets leggy. Once a stem is bare old wood it usually won't releaf, so neglected plants can't simply be cut hard to rejuvenate — the fix is prevention. A very overgrown plant is often best replaced (cuttings root easily).
Four-lined plant bug
Sign: Small, sunken, round dark or translucent spots on the leaves in late spring, where the bright green-and-black-striped bug has fed; damage is mostly cosmetic.
Fix: The damage looks alarming but rarely harms an established plant. The bug feeds for only a few weeks in early summer and then is gone; tolerate it, knock bugs off by hand, and prune out badly spotted shoots. Insecticides are seldom warranted.
Leaf spot and gray mold (Botrytis) in humid conditions
Sign: Brown or gray spotting, dieback of shoot tips, and fuzzy gray mold on flowers and foliage during wet, humid weather or in crowded plantings.
Fix: Manage it culturally: space plants for airflow, water at the base in the morning, use gravel mulch, and prune to open the plant up. In hot, humid regions choose humidity-tolerant types like 'Phenomenal' and avoid overhead watering.

Companions

Grows well with
RosesRosemarySageThymeOreganoEchinacea and other dry-loving perennialsYarrow
Keep apart from
Moisture-loving plants (mint, basil, most vegetables) that demand richer, wetter soilAnything that shades it or blocks airflowAcid-loving plants like azaleas, blueberries, and rhododendrons whose soil and watering needs are the opposite of lavender's

Harvest & storage

Harvest
Harvest the flower spikes on a dry morning after the dew lifts, when the lowest one or two florets on a spike have just opened and the rest are still in colored bud — that's when fragrance and oil are highest. Cut whole stems with sharp snips, gathering them into small bundles. Cutting for harvest doubles as a tidy-up; just keep your cuts above green leaves.
Storage
Dry bundles upside down in a warm, dark, airy spot for a couple of weeks, then strip the buds for sachets, culinary use, or potpourri; dried buds keep their scent for many months in a sealed jar away from light. Fresh-cut stems also last well in a vase. Use culinary lavender (English types) for cooking — lavandins are more camphorous and better for crafts and oil.

Sources

This guide is curated from authoritative horticulture references — primarily US university Extension services, the USDA, and the RHS.