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Switchgrass
Panicum virgatum
Switchgrass blooms from August through October.
Mature size, hardiness zones, sun and the trait tags were checked against named botanical sources for this plant. The bloom months and water need on this page were not.
Growing Switchgrass
Plant it in full sun. It prefers low water. It is hardy in USDA zones 4–9. Expect it to reach about 4.9 ft tall and 2.6 ft wide at maturity, in roughly 3 years.
When to plant Switchgrass
Plant Switchgrass 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. For the middle of its hardy zones 4 to 9 range, spring means March to May and fall means August or September. Once settled, it blooms from August to October.
Month-by-month timing for your zone is on the planting calendar: for the middle of its range, start with zone 6 in March.
Comes in 3 varieties across 2 colors
Same plant, same care - pick the color you are growing.
Good to know about Switchgrass
Curated from university extensions, botanic gardens and other primary sources, with the source named on every note.
Safety
Young, growing plants harm grazing sheep, goats and horses: steroidal saponins cause liver injury and photosensitization. Not a documented dog or cat poison. per ASPCA and Wyoming
Worth knowing
Flopping is its main flaw, and shade and rich soil both cause it. Full sun plus lean, poor ground is what keeps the clump upright. per Wisconsin
Cold hardiness varies by cultivar
Southeast sources rate it zone 5 to 9; northern ones to zone 3a, with cultivars to 4a. It depends on the ecotype, so match the cultivar to your zone. per NC State and Wisconsin
Best for winter interest
Its stiff stems and tan seed plumes stand upright all winter for structure, cover and bird seed. Cut the clump back in late winter, not fall. per Penn State
Feeds birds and butterflies
Not a nectar plant but high wildlife value: a larval host for skipper butterflies, and its seeds and standing winter stems feed and shelter songbirds and small mammals. per NC State
Built for tough sites
NC State rates it resistant to deer, drought, erosion and air pollution, and slightly salt tolerant, so it holds up on exposed or roadside ground. per NC State
Spreads slowly, stays clumping
It self-seeds modestly and creeps by short rhizomes but stays a clump, not a running invader. How much it sows varies by cultivar and site. per Missouri
What pairs well with Switchgrass
Good companions share its growing conditions and add something it lacks: an earlier or later bloom, a lower carpet in front, or structure through winter.
Thyme
Shares full sun and low water; blooms in late spring, before this one opens; low at 6 in, to carpet the ground beneath.
Creeping Phlox
Shares full sun and low water; blooms in mid spring, before this one opens; low at 6 in, to carpet the ground beneath; both are native plants.
Grape Hyacinth
Shares full sun and low water; blooms in early spring, before this one opens; low at 8 in, to carpet the ground beneath; blue against pink, for contrast.
Crocus
Shares full sun and low water; blooms in late winter, extending the bed's season; low at 4 in, to carpet the ground beneath.
Basket of Gold
Shares full sun and low water; blooms in mid spring, before this one opens; low at 8 in, to carpet the ground beneath.
Gazania
Shares full sun and low water; lower at 10 in, for the front of the border; opens in early summer and overlaps into this one's season; orange sits close to pink on the wheel.
Portulaca
Shares full sun and low water; low at 6 in, to carpet the ground beneath; opens in early summer and overlaps into this one's season; orange sits close to pink on the wheel.
California Poppy
Shares full sun and low water; opens in late spring and overlaps into this one's season; lower at 12 in, for the front of the border; both are native plants.
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