Do you know this little onion?
Commonly called Japanese onion, Allium thumbergii is the latest of all ornamental onions to flower. Loose, mop-like heads atop thin scapes feature tiny, cup-shaped blooms, each with six tepals and elongated stamens.
The species grows 18 to 24-inches tall, but look for the compact Ozawa, which is more floriferous and has larger flower heads. A white-flowered form known as ‘Alba’ is equally stunning.
Native to Asia, where it grows along woodland margins, Japanese onion is easy to grow in full sun to part shade. Choose areas with well-drained, average soils, taking care to avoid damp conditions.