Achnatherum calamagrostis

Silver Spike Grass

Exclusive. Silver Spike grass is an outstanding Old World species grown for its late spring display of silver-green flower spikes. The seed heads age to tawny brown and hold on the plant into the fall. Drought Resistant/xeric. Introduced into cultivation in the US by Lauren Springer Ogden. 2006 Plant of the Year.
Zones5 - 8
Advantages
Easy To Grow
Adds Texture
Light Requirements
Full Sun
Annual Rainfall
10 to 20"
20 to 30"
30 to 40"
40 to 50"
Mature Height36" tall
Mature Spread36" wide
ShippingNo longer available this season. Learn More…
SizeNo
SKUHC016081

USDA Hardiness Planting Zones

To determine if a plant is sufficiently cold hardy, the USDA created numbered zones indicating winter low temperatures; the lower the zone number the colder the winter.

  • If the coldest winter temperature expected in your area is -15°F (zone 5) then any plants rated zones 3-5 will survive the winter temperatures in your area.
  • If you live in very warm winter areas (zones 9-11) plants with zones 3-4 ratings are not recommended. The lack of freezing winter temperatures do not provide a time for winter dormancy (rest).

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SKU
HC016081

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Details
A spectacular European native, Silver Spike Grass (Achnatherum) is both a graceful and free-flowering summer blooming ornamental grass. It will beautify your garden with its showy, silver-green flowering spikes that turn a rich tawny brown in the fall. For best garden performance Silver Spike Grass should be grown in the western US (and other higher altitude areas of the country) where summer humidity is low and nights are cool. Seed of this grass comes to us by way of Lauren Springer Ogden, who has pioneered the use of it in this country by successfully cultivating it in CO for over 8 years. Achnatherum is sure to be extremely popular as it is a distinctive, specimen-worthy species with highly visible areas of your landscape.  Flat of 9 plants will cover 30 square feet when planted together. 36" tall x 36" wide (seed/division propagated). 2006 Plant of the Year.
More Information
Associated SKUsHC016081
Common Name
Silver Spike Grass
Botanical Name
Achnatherum calamagrostis
Zones
5, 6, 7, 8
Light Requirements
Full Sun
Mature Height
36" tall
Mature Spread
36" wide
Ships As
Potted Plant
Soil Type
Sandy Soil, Clay Soil, Average Soil
Soil Moisture
Average
Amount Of Rain
10 to 20", 20 to 30", 30 to 40", 40 to 50"
Advantages
Easy To Grow, Adds Texture
Awards
Perennial Plant of the Year
Special Groups
High Country Gardens Exclusive, High Country Gardens Introduction
Ideal Region
West, Western Only, Pacific Northwest, Suitable Above 7000 ft
Planting Time
Spring / Summer, Fall
Neonicotinoid Free
Item Unit Of Measure
Tray
Ships To Canada
No
Planting Guides

View more Planting Guides, or download our complete Planting Guide for tips on caring for your plants when you receive your order, as well as planting instructions for Perennials, Spring-Planted Bulbs, Fall-Planted Bulbs, Cacti & Succulents, Xeric Plants and more.
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No longer available this season.

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