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Heavy Metal Blue Switch Grass

Panicum virgatum (PAN-ih-kum ver-GAY-tum HEH-vee MEH-tal)

Family: Poaceae Unknown Herbaceous (3-15 ft)

Panicum virgatum 'Heavy Metal' is a deciduous perennial, ornamental grass cultivar, which is known for its compact, upright, columnar, clumping habit and stiff, metallic blue-green foliage. The foliage transitions to amber yellow in the fall and then to tan during the winter months. Its flowers are panicles of airy, pink-tinged blooms with dark burgundy seed heads. The seed heads are a food source for birds and small mammals over the winter, and the foliage provides shelter. The plant grows 4 to 5 feet tall and 1 to 2 feet wide. This plant is one of the oldest switchgrass cultivars, and was introduced in the 1980s by Kurt Bluemel in Maryland. Prefers full sun, and it will tolerate partial shade, but heavily shaded sites may cause the plant to topple over. Grows well in moist, sandy, or clay soil, and it is tolerant of both wet and dry soils. In late winter to early spring, prune this grass to the ground. Winter hardy in zones 4 to 9. This plant is easy to grow, requires very little maintenance, and is deer-resistant. Panicum virgatum 'Heavy Metal' may be used as an accent plant or planted in mass in borders, meadows, or naturalized areas. Since it is wet soil-tolerant, it may also be used in rain gardens, bog gardens, and near ponds. Insects, Diseases, and Other Plant Problems: No significant insect pests or diseases. Monitor for Japanese beetles, spider mites, and thrips. Crown rot and root rot can occur. May be susceptible to rust in hot and humid conditions. More information on Panicum virgatum .

Source: NC State Extension Gardener Plant Toolbox ↗ NC State Extension Gardener Plant Toolbox, 50 attributes.

How it fits the guild

Guild layer 4 - Herbaceous (3-15 ft) Optimal soil pH Acid (<6.0); Alkaline (>8.0); Neutral (6.0-8.0)
See companions & conflicts ↓

Companions & Conflicts

Curated pairwise relationships between this plant and others in the library — who feeds whom, who competes, who confuses the pests. Green reads as a good pairing, red as one to avoid.

No curated interactions recorded for this species yet.

Also noted by NC State

Related species the NC State Plant Toolbox flags for this plant — look-alikes to tell apart, and plants that play a similar role in a planting. Ones we carry in the library are linked.

Often confused with Panicum virgatum
Fills a similar niche Miscanthus sinensis 'Morning Light' Panicum virgatum 'Cloud Nine' Ulmus americana

Full plant profile

Growing Conditions
Plant type
Herbaceous Perennial; Ornamental Grasses and Sedges
Life cycle
Perennial
USDA zones
4a, 4b, 5a, 5b, 6a, 6b, 7a, 7b, 8a, 8b, 9a, 9b
Light
Full sun (6 or more hours of direct sunlight a day) | Partial Shade (Direct sunlight only part of the day, 2-6 hours)
Soil texture
Clay; Sand
Soil pH
Acid (<6.0); Alkaline (>8.0); Neutral (6.0-8.0)
Soil drainage
Moist | Occasional Flooding | Occasionally Dry | Occasionally Wet
Available space
12 inches-3 feet
NC region
Coastal; Mountains; Piedmont
Mature size
Height: 4 ft. 0 in. - 5 ft. 0 in. | Width: 1 ft. 0 in. - 2 ft. 0 in.
Growth rate
Rapid
Maintenance
Low
Canopy layer
4 - Herbaceous (3-15 ft)
Form & Appearance
Habit / form
Clumping; Columnar; Erect
Texture
Fine
Foliage
Deciduous
Leaf color
Blue; Gray/Silver
Leaf type
Sheath
Leaf shape
Linear
Leaf margin
Entire
Leaf feel
Glossy
Leaf value
Showy
Leaf size
> 6 inches long
Hairs present
No
Leaf detail
The leaves are linear, upright, stiff, and metallic blue-green. The fall color is amber-yellow, and the winter color is tan.
Fall color
Cream/Tan; Gold/Yellow
Flower color
Pink
Flower value
Good Cut; Good Dried; Long-lasting; Showy
Flower form
Panicle
Flower detail
The flowers are displayed on panicles with airy pink-tinted blooms and dark burgundy seed heads, blooming from mid-summer to late summer, and lasting through February.
Bloom time
Summer
Fruit type
Caryopsis
Wildlife & Ecology
Native status
Unknown
Wildlife value
The seeds provide a food source for birds and small mammals.
Attracts
Butterflies; Small Mammals; Songbirds
Play value
Colorful; Easy to Grow; Wildlife Cover/Habitat; Wildlife Food Source
Food & Medicine
Fruit type
Caryopsis
Landscape Use
Landscape location
Container; Meadow
Landscape theme
Rain Garden
Design feature
Border; Mass Planting
Garden tags
#fall interest #deer resistant #black walnut toxicity tolerant #dried flowers #drought tolerant #dry soils tolerant #erosion control #full sun #partial shade tolerant #pink flowers #rain garden #urban conditions tolerant #wet soils tolerant #winter interest #clumping #columnar #erect #fast growing #ornamental grass #shelter for wildlife #herbaceous perennial
Problems & Resistance
Resistant to
Black Walnut; Deer; Drought; Dry Soil; Erosion; Pollution; Wet Soil
Fire risk
high flammability

Planted at Hunnicutt

Nobody’s planted this one yet.