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French lavender

Habit (mature) - Josep Gesti / Wikimedia Commons - CC BY-SA 4.0

Limited coverage

French lavender

Lavandula stoechas

A compact, evergreen, aromatic subshrub from the Mediterranean basin, 18-36 inches tall and wide, with narrow grey-green leaves and dense, dark-purple flower spikes that are each topped by a showy tuft of violet bracts — the unmistakable "rabbit ears" that distinguish French lavender from English lavender. It loves heat, full sun, and sharp drainage, blooms long and early, and is one of the best bee and butterfly nectar plants you can grow on a hot, dry site. Be clear-eyed about its limits, though: it is less cold-hardy than English lavender (Lavandula angustifolia), it is short-lived on heavy or wet soil, and it self-seeds readily — it is recorded as invasive in parts of Australia and other Mediterranean-climate regions, so deadhead it and site it responsibly outside its native range. It is intensely aromatic but is NOT the culinary lavender, and it is grown as an ornamental rather than for food.

Climate fit: narrow (27/100)

Pollinator

Border

Light

Full sun

Water

Low water

Mature size

18-36" tall · 24" apart

Hardy in zones

7b-9b

cold to frosty winters

Native in Illinois

The dense purple spikes are insect-pollinated and self-fertile, and French lavender is an outstanding nectar plant: honey bees, mason bees, and other solitary bees work it heavily, alongside hoverflies and butterflies such as painted ladies.

°C

°F

Cold hardiness

Future

2050

2100

These values are location-based: this location's current hardiness is the baseline, and the 2050 value is a projected future climate for this same location.

Now

Zone 6b

USDA

Published baseline for this location from 1991-2020.

Source: USDA Plant Hardiness Zone Map 2023 (1991-2020 climatology) via ArcGIS FeatureServer

Won't grow here

2050

Zone 7a

Plotwright

Projected zone for this same location in 2050 (2041-2070) using SSP3-7.0 (regional rivalry).

Won't grow here

In plain terms: This location is in Zone 6b today. Its hardiness profile is cold winters, and coldest nights are typically around -3°F. By 2050, the projected hardiness zone is Zone 7a based on SSP3-7.0 (regional rivalry). That is a +0.5-zone shift from Zone 6b to Zone 7a by 2050.

Out of range today and still out of range in 2050.

Heat tolerance

Future

2050

2100

Heat tolerance values are location-based too: heat days today are observed at this site, and the 2050 value projects this same location under a future climate.

Loading AHS heat-zone data for this location...

Where this plant fits

Suitable across 38 ecoregions — 32 climate-resilient through 2070 · 1 suited today · 5 newly possible by 2070. Best matches first.

Appalachian mixed mesophytic forests

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Appalachian-Blue Ridge forests

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Arizona Mountains forests

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Atlantic coastal pine barrens

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Blue Mountains forests

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Canadian Aspen forests and parklands

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Central Pacific Northwest coastal forests

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Central Tallgrass prairie

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Central-Southern Cascades Forests

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Chilean Matorral

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What it needs

Conditions

Light

Full sun

Water

Low water

Spacing

24"

Habit

Compact evergreen aromatic subshrub with narrow grey-green foliage and dense dark-purple flower spikes topped by tufts of showy violet "rabbit-ear" bracts. It demands full sun and sharp drainage, is drought-tolerant once established, but is less cold-hardy than English lavender and short-lived on heavy or wet soil; it self-seeds readily and is recorded as invasive in some Mediterranean-climate regions, so deadhead and site it responsibly.

Care tips

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Give it full sun and the sharpest drainage you can manage — a slope, raised bed, or gravel garden — and keep it on the dry side; wet or heavy soil is the usual cause of an early death.

•

Shear lightly after the main flush and again in early spring, always cutting into green growth and never hard into bare old wood, which rarely regrows.

•

Deadhead spent spikes to prolong bloom and to limit self-seeding, especially in Mediterranean-climate regions where it can escape and naturalize.

Lifecycle

Planting

Plant in spring in full sun and free-draining, even gritty or poor soil, ideally on a slope, raised bed, or gravel garden where water never sits. Space about 24 inches apart for a low informal hedge or drift. Avoid heavy clay and rich, moisture-retentive ground, which shorten its already brief life.

Transplanting

Move young plants in spring once frost has passed, keeping the root ball intact and the crown high; lavenders dislike root disturbance and resent being lifted once established, so it is usually better to start a fresh plant from a cutting than to relocate an old one.

Early growth

Water lightly to establish through the first season, then taper off — once rooted it is strongly drought-tolerant and far happier kept dry than wet. Pinch or shear lightly after the first flush to encourage a bushy, well-branched plant rather than a leggy one.

Maturity

Matures within a few years into a rounded, free-flowering mound. Shear over lightly after the main flush and again in early spring, always cutting into green growth and never hard into bare old wood, which seldom regrows. Deadhead spent spikes both to prolong bloom and to limit self-seeding, and plan to replace plants every few years as they go woody.

Propagation

Easily propagated from semi-ripe cuttings in summer, which is the reliable way to keep named, Award-of-Garden-Merit forms true and to renew short-lived plants. It also self-sows readily from seed — convenient for replacements, but the same trait drives its invasiveness, so collect or deadhead seed where escape is a concern.