Illustration
Blue Ice Blue Star
Amsonia 'Blue Ice'
Also called blue ice amsonia and bluestar 'blue ice'
Blue Ice Blue Star blooms from May through June.
Months here are Northern Hemisphere months; in the Southern Hemisphere, shift them by six months.
Growing Blue Ice Blue Star
Plant it in full sun. It prefers moderate water. It is hardy in USDA zones 4–9. Expect it to reach about 16 in tall and 24 in wide at maturity, in roughly 3 years (a house reading).
Pets
- Not yet checked for pets.
Lists differ and none is complete. If a pet eats a plant and seems unwell, call a veterinarian or a pet poison helpline.
No toxicity note is on file for Blue Ice Blue Star. That is not a clearance: check its safety for people and pets before planting.
What was checked
Mature height and spread, hardiness zones, sun, water, bloom months and color and the trait tags were checked against named botanical sources for this plant, with what the sources could not settle written down; years to mature size rests on a recorded house rule where no publisher states one, and is marked so; its common name and alternate names have not been checked yet. Each fact above carries its own mark. The planting, spacing and size sections are derived from these checked facts by a fixed rule, not checked separately, and the plant type is the library's own classification.
When to plant Blue Ice Blue Star
Plant Blue Ice Blue Star in early spring as soon as the soil is workable, or in early fall at least six weeks before your first frost, so roots establish in cool weather. In zone 6, the middle of its hardy zones 4 to 9, spring means March to May and fall means August or September. Once settled, it blooms from May to June.
Month-by-month timing for your zone is on the planting calendar; if you garden near zone 6, the middle of this plant's hardy range, start with zone 6 in March. Derived from the plant's category, zones and bloom months plus typical zone frost dates, not checked separately.
How big does Blue Ice Blue Star get?
16 intall5 ft 7 inan adult24 inwideSee Blue Ice Blue Star in a garden plan: the planner shows it in 3D beside everything else you add, growing toward this size over the years.
How far apart to plant Blue Ice Blue Star
Derived from the mature spread above by a fixed rule, not checked separately: spacing is the spread, center to center.
Space Blue Ice Blue Star about 24 in apart, center to center, so each plant has room to reach its full width.
Add Blue Ice Blue Star to a garden plan and the planner draws it at its full width, so you see the spacing before you buy.
Where these facts come from
Blue Ice Blue Star's height, spread, hardiness zones, sun, water, bloom months and color, trait tags, soil, diseases, pests and toxicity were checked against 12 published sources on October 10, 2026. Each one is linked below with every fact it carried, which can include a fact this page still marks as not yet checked, because a source carrying a value is not the same as the value being held to the standard. Facts not in that list, and the planting, spacing and size sections, are not covered by these sources.
- Missouri Botanical GardenAmsonia 'Blue Ice', taxonid 256518height, spread, hardiness zones, sun, water, bloom months and color, trait tags, soil, diseases, pests and toxicity
- NC State Extensionits Amsonia 'Blue Ice' pageheight, spread, hardiness zones, sun, water, bloom months and color, trait tags, soil, diseases, pests and toxicity
- whiteflowerfarm.comWhite Flower Farm (Litchfield, Connecticut; the nursery where the plan...height, spread, hardiness zones, sun, water, bloom months and color, trait tags, soil, pests and toxicity
- RHSRoyal Horticultural Society plant profile (Amsonia 'Blue Ice')height, spread, sun, water, bloom months and color, soil, diseases and pests
- Chicago Botanic GardenFine Gardening issue 187, June 2019, pp. 46 to 53, the print article a...height, spread, hardiness zones, sun, bloom months and color, soil and diseases
- North Creek Nurseriesa wholesale grower, Landenberg, Pennsylvaniaheight, spread, hardiness zones, sun, bloom months and color, trait tags and pests
- Plant Addictsthe queue's store; its Brand field is emptyheight, spread, hardiness zones, sun, water, bloom months and color and soil
- Plant Delights Nurserythe nursery that renamed and introduced 'Blue Ice'; an archive pageheight, spread, hardiness zones, sun, trait tags, soil and pests
- usperennials.comUS Perennials (a nursery in Bloomington, Indiana)height, spread, hardiness zones, water, bloom months and color and trait tags
- Fine GardeningRichard Hawke, plant evaluation manager at the Chicago Botanic Garden,...height, bloom months and color, trait tags and toxicity
- Chicago Botanic Gardenan archived copy captured before February 2022hardiness zones, sun and bloom months and color
- NC State Extensionits Amsonia tabernaemontana pagebloom months and color and diseases
How the checking works, and what each standard covers, is on the verified plants page.
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Design a garden with this
Drop this plant onto a 3D plan, see how it fills in, and watch your whole garden bloom across the year.