Pronounciation: La-van-DO-la den-TA-ta
Sunset 8, 9, 12-24
USDA 8-11, otherwise as summer annual in zones 1-7
Landscape Use: 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 hot humid weather of monsoon. 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 some soft wood cutting.
Disease and pests: Rot root in poorly drained soils.
Additional comments: Like English lavender, attracts bees and butterflies. Differentiated from L. angustifolia (English lavender) by presence of marginal leaf dentations. Lavendula contains over 20 species of aromatic herbaceous or woody shrubs.