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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

Shipping: Buy now and we'll ship your order at the ideal planting time for your region.

SKU: 10100

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Availability: In stock

Regular Price: $9.99

Sale: $7.99

Plant - 5" deep pot
Additional Information
SKU 10100
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
Planting Season Spring / Summer, Fall
Soil Type Clay Soil, Sandy Soil, Average Soil
Soil Moisture Average
Amount of Rain 10 to 20", 20 to 30", 30 to 40", 40 to 50"
Special Groups High Country Gardens Exclusive, High Country Gardens Introduction
Ideal Region Western Only, Suitable Above 7000 ft
Neonicotinoid-Free Yes - Learn More
36" tall x 36" wide (seed/division propagated). A spectacular European native, 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 for highly visible areas of your landscape.


by PowerReviews
Achnatherum calamagrostis

(based on 1 review)

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Reviewed by 1 customer

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High Desert Grassland


from Central Oregon/Prineville

About Me Avid Gardener


  • Attractive
  • Hardy
  • Healthy
  • Lightweight


    Best Uses

    • Garden
    • Patio
    • Pool Area

    Comments about Achnatherum calamagrostis:

    Lovely profile, especially combined with Karl Forster. The coloring is delicate, and the effect is especially pleasing in a breeze. We use this among fescue,other calamogrostis plants and kinnickinnick in a rocky native planting.

    • Primary use:
    • Personal

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    Planting Guides
    View or download our complete Planting Guide (pdf) 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.

    Plant Shipping: Buy now and we will ship your order at the ideal planting time for your region. Your plant orders are scheduled to arrive within 3 days or less of leaving our greenhouses. This prompt delivery is provided without additional express charges. Our Standard Plant Shipping is 3 Days!

    Grass Plugs & Seed: Most orders ship within 5-8 business days (all zones).

    Gardening Goods: All non-plant items ship within 2-3 days.

    Standard shipping costs are $4.99 and up, depending on the size of the order.

    Make Fast Even Faster: For ‘Rush’ same week delivery, please call customer service at 800-925-9387.

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