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A picture of a Blue star

Blue star

Amsonia spp.

Rhazya orientalis57692285 by Linda (CC BY 2.0)

Full Sun
Moderate watering
Frost Hardy

8a

USDA zone

-12°C

Minimum temperature

Expected size

Height
Spread

1.2m

Max

12.5cm

Min

Flowering

  • spring
  • summer
  • autumn
  • winter

More images of Blue star

Rhazya orientalis57692285
Amsonia-tabernaemontana-flowers

Blue star Overview

Commonly called bluestars, the genus Amsonia contains around 20 hardy, clumping perennials. They tend to grow slowly and produce star-shaped blue flowers during summer. Originating from areas in the USA, Asia and Europe, some species in this genus are threatened in the wild.

How to propagate Blue star

Cuttings

Propagate by division in spring, by softwood cuttings in summer and by seed in autumn.

Division

Seed

Other uses of Blue star

Grown for foliage and floral interest. Borders.