Perennials & Grasses

French lavender

Lavandula dentata

French lavender is a woody, aromatic subshrub with fragrant foliage and violet-blue flower spikes in summer. It generally reaches about 2–3 feet tall and can spread 3–5 feet, giving it more room than a narrow border edge might allow. In Southwest Washington, give it full sun, open air, and sharply drained soil, preferably in a raised bed or container where winter rain will not linger around the crown. It suits herb gardens and sunny borders, and its flowers draw bees. Expect limited cold tolerance: a sheltered position and winter protection matter, especially when temperatures fall after prolonged wet weather.

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At a glance

Mature height
About 2–3 feet
Mature spread
About 3–5 feet
Light
Full sun
Hardiness
Half-hardy; needs a sheltered site and winter protection

The right plant, the right place

Make room for something good.

Its fragrant foliage and summer flowers suit herb gardens, rock gardens, and sunny border edges. The flowers attract bees, so leave room for both the mature spread and pollinator activity.

Where to plant

Choose a sheltered spot in full sun with air movement. Allow about 3–5 feet for its spread, or grow it in a container where drainage and winter exposure are easier to manage.

Through the seasons

Fragrant foliage provides interest beyond bloom. Violet-blue flower spikes appear in summer; flowering may last longer in milder conditions.

Southwest Washington gardens

Give it a good start.

Southwest Washington's wet winters make drainage and cold exposure the main siting concerns. A raised bed or movable container can help protect the crown from persistent moisture.

Soil, drainage & water

Plant in sharply well-drained, lean soil; sandy or rocky ground is suitable. Water during establishment, then avoid frequent watering and heavy fertilizer.

A little care goes a long way

Growing well, season after season.

Trim lightly after flowering to maintain shape, leaving leafy growth below each cut. Avoid cutting into bare old wood or pruning in autumn where winters are wet or cold.

Know what to look for

Common growing concerns.

Symptoms can have more than one cause. These notes are a starting point for observing your plant and improving its growing conditions.

Root or crown rot

Wilting or dieback when soil stays wet.

Help your plant thrive

Improve drainage and avoid overwatering. Check the crown and roots if the plant declines.

Leaf spot

Spots develop on leaves, particularly under damp conditions.

Help your plant thrive

Give plants full sun and air movement, and avoid wetting foliage unnecessarily.

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