Alyssum alpestre – Madwort

Description

Alyssum – Madwort There are about 170 species from Europe, North Africa, and Southwest and Central Asia of tufted, mat, or hummock forming perennial and sub shrubs, in this genus.  Mainly low spreaders with small 1/8-1” elliptical leaves.  In spring and early summer they are smothered in corymb-like racemes of tiny white, cream, yellow, or pink 4 petaled, cross-shaped flowers.  Most are less than 8” tall with a few of shrubbier species reaching 24” tall. Grow in full sun with gritty moderately fertile well drained soil, ideal for growing in rock crevices and dry stone wall plants, soak in spring and summer.  They’re fairly frost hardy.  Trim lightly after flowering to maintain compactness. Prone to club root, downy mildew, basal stem rot, root rot, caused by fungi may occur as well as aphids. Alyssum alpestre – This native to the Western and Central Alps grows to about 6” tall and can spread indefinitely.   This mat forming perennial carries spoon-shaped grayish green basal leaves ¼” long.  Bears elongated clusters of numerous fragrant tiny yellow flowers in summer. Zones 5-9