How to Grow Autumn Blaze Ornamental Grass
Wikimedia Commons
Autumn Blaze Ornamental Grass
Panicum virgatum 'Autumn Blaze'
grassAutumn Blaze is a cultivar of switchgrass that features striking red and burgundy fall foliage, transforming from blue-green in summer to brilliant crimson tones by autumn. This native North American grass grows 4-5 feet tall and provides season-long visual interest, fine texture, and movement in the landscape. Its airy panicles of flowers and persistent seed heads offer ornamental value well into winter.
When should you plant Autumn Blaze Ornamental Grass in your zone?
Get a personalized planting timeline — when to start seeds, transplant, and harvest — based on your USDA zone and local frost dates. Free to start.
Example Autumn Blaze Ornamental Grass timeline · Pittsburgh, PA (Zone 6b)
-
Plant Autumn Blaze Ornamental Grass
Around Apr 17Near Pittsburgh's average last spring frost.
-
Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
-
Harvest Autumn Blaze Ornamental Grass
Around Apr 19≈ 2 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Autumn Blaze Ornamental Grass dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives best in zones 4-8, but hardy and adaptable across zones 3-9
Sign up free to see if Autumn Blaze Ornamental Grass grows in your zone — and get a personalized planting timeline.
Get my Autumn Blaze Ornamental Grass timeline →Growth Stages
Germination & Establishment
3-6 weeks for germination; 1st full season for root establishmentSeeds sprout and seedlings emerge with fine, hair-like leaves. First-year plants grow slowly and remain relatively small.
Keep soil consistently moist during germination (2-3 weeks). Transplants establish faster than seed. Do not let soil dry completely in first season.
Spring Growth
April-May (spring)New shoots emerge from dormant crowns as soil warms. Plant exhibits rapid growth and bright green-blue foliage.
Cut back old foliage to 4-6 inches in early spring before new growth emerges. Do not cut back in fall. Apply light mulch around base if desired.
Summer Vegetative Growth
June-August (3 months)Plant reaches full height of 4-5 feet with fine, upright foliage in blue-green tones. Minimal watering needed if planted in well-draining soil.
Generally no fertilization needed. Staking rarely necessary unless in very sheltered location. Maintain weed-free area around base.
Flowering & Autumn Color
August-November (4 months)Airy panicles emerge in late summer, followed by dramatic color transformation to deep red, burgundy, and orange hues in fall.
Do not deadhead or remove flowers. Allow panicles and foliage to persist through fall and winter for maximum visual impact and wildlife habitat.
Winter Dormancy
December-March (winter)Foliage dries to tan-bronze, seed heads persist. Plant appears architectural and dramatic, providing winter structure and interest.
Do not cut back until early spring. Remove any volunteer seedlings if self-seeding is undesired. Grass provides shelter for overwintering beneficial insects.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
-
Usually not a significant problem. Tolerant of minor insect damage. Remove affected foliage if severe; rarely requires treatment.
-
Increase humidity and air circulation. Hose off with water if needed. Rarely problematic in established plantings.
-
Improve air circulation. Cut back old foliage completely in early spring. Fungicide rarely necessary for established plants.
Uses
Fall & Winter Landscape Color
OrnamentalAutumn Blaze provides stunning crimson to burgundy foliage in fall, with persistent seed heads and tan-bronze winter color. It serves as a focal point in gardens from late August through spring, offering four-season interest in landscape design. [source]
Wildlife Habitat & Food
WildlifeThe dense clumps provide shelter and nesting material for birds and beneficial insects. Seeds feed songbirds and finches through fall and winter months. The plant supports pollinators during its late-summer flowering stage. [source]
Dried Arrangements & Crafts
HouseholdPanicles and seed heads can be cut and dried for floral arrangements, wreaths, and decorative displays. The tan-bronze dried material provides natural texture and interest in indoor arrangements. [source]
Erosion Control & Soil Stabilization
EnvironmentalDeep root systems help prevent soil erosion and improve soil structure. Well-suited for rain gardens, naturalized areas, and slopes where it tolerates poor conditions while stabilizing soil. [source]
Culinary & Traditional Uses
CulinaryAs a native American plant, switchgrass was traditionally used and has minor ethnobotanical significance. Modern interest focuses on biofuel potential rather than direct culinary use. [source]
Harvest Tips
Not harvested in traditional sense. Ornamental value is enjoyed year-round. Seed heads may be cut in late fall or winter for dried arrangements if desired. Cut back entire plant to 4-6 inches in early spring (before new growth) every year.
Fun Facts
- 🌱 Autumn Blaze switchgrass is a cultivated selection of Panicum virgatum, a native North American prairie grass that has been grown for thousands of years by indigenous peoples.
- 🌱 Unlike many ornamental grasses that decline in northern climates, Autumn Blaze is exceptionally cold-hardy and actually produces more vibrant fall color in cooler regions with significant temperature swings.
- 🌱 The plant is being researched as a renewable biofuel crop due to its deep root system, minimal input requirements, and ability to grow on marginal land unsuitable for traditional agriculture.
Gardening Terms
New to gardening? Learn about terms used in this guide:
Join 30,000 gardeners planning their gardens with LizPlants.
Get your personalized Autumn Blaze Ornamental Grass planting timeline
Tell us your zip code and we'll calculate exactly when to start Autumn Blaze Ornamental Grass seeds, transplant seedlings, and harvest — based on your USDA zone and local frost dates. Includes calendar reminders and printable task lists. Free to start.
Get my Autumn Blaze Ornamental Grass timeline →