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A picture of a Onosma

Onosma

Onosma spp.

Onosma helvetica fallax 2 by Franz Xaver (CC BY-SA 3.0)

Full Sun
Moderate watering
Half-hardy

10a

USDA zone

-1°C

Minimum temperature

Expected size

Height
Spread

Max

Min

Flowering

More images of Onosma

A photo of Onosma
A photo of Onosma
A photo of Onosma

Onosma Overview

A genus of between 80 to 150 species of flowering annual, biennial, perennial plants or subshrubs in the borage family with semi-evergreen foliage and long, pendant tubular flowers. They originate from the Mediterranean region and Western Asia where they are found in arid habitats on sandy or rocky substrates. In cultivation they prefer a sunny site with well-drained soil and protection from Summer wet. They do well in rock gardens.

Common problems with Onosma

How to propagate Onosma

Cuttings

Softwood cuttings in summer.

Seed

Seed in autumn.

Other uses of Onosma

Is suitable for rock gardens and banks. Grown for their long, pendent, tubular flowers.