Illustration
Avalanche Feather Reed Grass
Calamagrostis × acutiflora 'Avalanche'
Also called avalanche variegated feather reed grass and calamagrostis avalanche
Avalanche Feather Reed Grass blooms from June through July.
Months here are Northern Hemisphere months; in the Southern Hemisphere, shift them by six months.
Growing Avalanche Feather Reed Grass
Plant it in full sun. It prefers moderate water. It is hardy in USDA zones 4–8. Expect it to reach about 4.5 ft tall and 2 ft wide at maturity, in roughly 2 years (a house reading).
Pets
- No toxic listing found for dogs and cats in the sources we check.
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 Avalanche Feather Reed Grass. 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 Avalanche Feather Reed Grass
Plant Avalanche Feather Reed Grass 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 8, spring means March to May and fall means August or September. Once settled, it blooms from June to July.
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 Avalanche Feather Reed Grass get?
4.5 fttall5 ft 7 inan adult2 ftwideSee Avalanche Feather Reed Grass 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 Avalanche Feather Reed Grass
Derived from the mature spread above by a fixed rule, not checked separately: spacing is the spread, center to center.
Space Avalanche Feather Reed Grass about 2 ft apart, center to center, so each plant has room to reach its full width.
Add Avalanche Feather Reed Grass 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
Avalanche Feather Reed Grass' height, spread, hardiness zones, sun, water, bloom months and color, trait tags, soil, diseases, pests and toxicity were checked against 13 published sources on October 5, 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 GardenPlant Finderheight, spread, hardiness zones, sun, water, bloom months and color, trait tags, soil, diseases and pests
- Perennial Resource (Walters Gardens)Walters Gardens (Perennial Resource; wholesale grower, Zeeland, Michig...height, spread, hardiness zones, sun, water, bloom months and color, trait tags, soil and pests
- Plant Addictsheight, spread, hardiness zones, sun, water, bloom months and color, trait tags, soil and pests
- Fine GardeningRichard Hawke, Chicago Botanic Garden; issue 213height, hardiness zones, sun, water, bloom months and color, trait tags, soil and diseases
- hoffmannursery.comHoffman Nursery (wholesale grass grower, Rougemont, North Carolina)height, hardiness zones, sun, water, bloom months and color, trait tags, diseases and pests
- Chicago Botanic GardenPlant Finderheight, spread, hardiness zones, sun, water, bloom months and color and soil
- Perennials.com (Heritage Perennials)Heritage Perennials (Valleybrook International Ventures, perennials.com)height, spread, hardiness zones, sun, bloom months and color and soil
- Plant Delights Nurseryheight, hardiness zones, sun, bloom months and color, trait tags and pests
- The Morton Arboretumhardiness zones, sun, water, bloom months and color, soil and diseases
- usperennials.comUS Perennials (nursery, Bloomington, Indiana)height, spread, hardiness zones, sun, water and bloom months and color
- hoffienursery.comHoffie Nursery (wholesale grower, Union, Illinois)height, spread, hardiness zones, bloom months and color and trait tags
- NC State ExtensionGardener Plant Toolboxbloom months and color, diseases and pests
- ASPCAtoxicity
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.