Position

Sun exposure:
Dappled shade, full sun, partial shade
Aspect:
East facing, south facing, west facing
Position in border:
Middle

Soil

Prefers rich soil:
Acidic / Chalky / Alkaline / Clay / Heavy / Moist / Well Drained / Light / Sandy

Known commonly as blue star, amsonias bear starry flowers from late June. Slow-growing perennials, they lack drama but make the perfect foil for a number of more dramatic and colourful plants. The different species are hard to tell apart, but Amsonia illustris has shiny green leaves and large flowers. All amsonias have milky sap, which can irritate the skin.

Grow Amsonia illustris in humus-rich, moist soil, in full sun or semi-shade. Divide in early autumn if necessary.

Plant calendar

JanFebMarAprMayJunJulAugSepOctNovDec
Plantyesyesyesyesyes
Flowersyes
Divideyesyesyes

Amsonia and wildlife

Amsonia has no particular known value to wildlife in the UK.

Is Amsonia poisonous?

Amsonia can be toxic. Its sap is toxic.

Toxic to:
Is known to attract Cats
Cats
Is known to attract Dogs
Dogs
Is known to attract People
People
No reported toxicity to:
Is not known to attract Birds
Birds
Is not known to attract Horses
Horses
Is not known to attract Livestock
Livestock
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