Description

Allium – Onion

There are about 700 species of bulbous perennials and biennials, in this genus. Native to temperate regions in the northern Hemisphere and Western and Central Asia.  A single bulb produces clusters of off sets bulbs around it, which gradually forms clumps and range in height from 4” to 5’ feet tall.  They bear bell, star, cup, and spherical, sometimes hemispherical or ovoid occasionally pendent ½-12” wide flower heads.  The linear to strap shaped basal or stem-clasping leaves when bruised or cut excrete onion smell.  They bloom in spring and autumn and some species are edible and have culinary uses.  Contact with bulb may irritate skin.

They prefer to grow in open sunny position in fertile well-drained, weed free soil.

Prone to onion fly, stem eelworm, rust, onion white rot, bulb rots, White rot, mildew, smut and various fungal leaf spots thrips.

Allium oreophilum ‘Zwanenburg’ – Allium ostrowskianum ‘Zwanenburg’ – This clump forming bulbous grows 2-8” tall and derives from the Caucasus and Central Asia.  The name means ‘Mountain loving’.  It produces linear mid green leaves 4-6” long, which are slightly longer then the stems.  In early summer it bears loose umbels 1 ½” across of up to 15 long lasting bell shaped deep carmine flowers.

Zones 4-9