Scientific: Lavandula dentata
Common: French lavender, toothed lavender
Family: Lamiaceae
Origin: Spain

Pronounciation: La-van-DO-la den-TA-ta

Hardiness zones
Sunset
8, 9, 12-24
USDA 8-11, otherwise as summer annual in zones 1-7

Landscape Use: Cool season flowering accent, edging, herb for aromatic gardens. Attracts bees, butterflies and birds.

Form & Character: Densely mounding and rounded except when in flower.

Growth Habit: Evergreen perennial, mounding to 2 feet tall with greater spread.

Foliage/Texture: Opposite, strongly dentate to pinntified, sweetly aromatic, margins entire, lanceolate to linear-oblanceloate, 2.5 incheslong by 0.25 inch wide, tomentose nearly white when immature to grey green at maturity; medium fine texture.

Flowers & Fruits: Multiple unbranched spikes to 3.5 inches long, verticillaster (whorled about the spike), 6 to 10 flowered, calyx about 0.25 inch long, 13-nerved, dense pubescent corolla twice as long as calyx, usually violet blue but cultivar dependent; fruits are a small nutlet, inconspicuous.

Seasonal Color: Flowers during the cool season, late fall through spring.

Temperature: Best below 105oF. Highly susceptible to root rot during the Sonoran Desert's hot humid monsoon weather of July and August. Not as cold hardy as English lavender.

Light: Full sun, except in Phoenix it needs protection from reflected western sun.

Soil: Well drained soil best, but tolerant of all but heavy clay. Avoid highly organic and amended soils.

Watering: Regular, but French lavender will take some drought especially during the cooler season. Withholding a little bit of water keeps this plant 'tight and bushy'.

Pruning: Lightly shear after bloom to promote compact habit.

Propagation: Seed and sometimes soft wood cutting (use a perlite based rooting substrate for good drainage).

Disease and pests: Rot root in poorly drained soils.

Additional comments: Like English lavender, French lavender attracts bees and butterflies and is differentiated from L. angustifolia (English lavender) by the presence of distinct leaf marginal dentations.

Lavendula contains 39 species of aromatic herbaceous or woody shrubs.