How to Grow Tallgrass Cultivars
Tallgrass Cultivars
Various species (primarily Andropogon gerardii, Panicum virgatum, Sorghastrum nutans)
grassTallgrass cultivars are perennial grasses selected for restoration of prairie ecosystems and ornamental landscaping. These native grasses can reach heights of 4-8 feet and create dramatic seasonal color changes from green to bronze and gold. They are drought-tolerant, low-maintenance, and provide essential habitat for wildlife while requiring minimal fertilizer or pesticides.
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Example Tallgrass Cultivars timeline · Pittsburgh, PA (Zone 6b)
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Plant Tallgrass Cultivars
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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Harvest Tallgrass Cultivars
Late summer into fallBefore the first fall frost (≈ Nov 8)
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Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 3-8; native to the tallgrass prairie region of central North America
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Get my Tallgrass Cultivars timeline →Growth Stages
Seed Germination & Establishment
3-6 weeks for germination; slow growth year 1Tiny seedlings emerge with fine, hair-like leaves. Growth is slow in the first year with minimal above-ground height.
Keep soil consistently moist (not waterlogged) for 4-8 weeks after germination. Reduce watering gradually as plants establish. Protect from foot traffic. Cold stratification (60 days in moist, cool conditions) improves germination rates.
First Year Growth
6-12 monthsSeedlings develop deeper root systems; above-ground growth remains modest, typically 1-2 feet tall by fall.
Water weekly during dry periods. Remove competing weeds by hand or light cultivation. Do not fertilize heavily as it promotes weak growth and disease. Allow plants to establish naturally.
Vegetative Establishment (Year 2)
Full growing season (spring to fall)Mature root systems develop; above-ground growth accelerates dramatically. Plants reach 3-6 feet or more by midsummer.
Reduce watering to drought periods only. Remove dead thatch from previous year in early spring (before growth resumes). Monitor for early weeds but established grasses suppress competition naturally.
Flowering & Seed Production
6-10 weeks (July-September depending on species)Distinctive seed heads emerge in mid to late summer; flowers are tiny and wind-pollinated, arranged in panicles, spikes, or racemes depending on species.
Do not deadhead if wildlife habitat is desired; seeds provide food for birds and insects. Some cultivars produce dramatic bronze, purple, or copper-colored seed heads.
Fall Dormancy & Winter Interest
October through MarchFoliage transitions from green to gold, bronze, orange, or reddish hues. Seed heads persist through winter, providing structure and beauty.
Do not cut back until early spring (late February to early April) as dead standing grass provides winter insulation and wildlife habitat. Burn or remove thatch in spring as part of prairie management.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Rarely damaging to established stands; encourage natural predators; avoid over-fertilization
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Usually self-limiting; apply neem oil if populations are severe; maintain plant vigor
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Minor issue in established plantings; provide habitat for natural predators (birds, spiders)
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Improve air circulation; remove dead thatch; allow plants to dry between waterings; rarely requires treatment in prairie settings
Uses
Native Habitat & Pollinator Support
WildlifeTallgrass prairies provide essential nesting, cover, and food sources for birds, insects, and small mammals. Seed heads feed migrating songbirds and late-season wildlife. Root systems create soil structure that supports beneficial microbial communities. [source]
Ornamental Landscaping & Garden Design
HouseholdDramatic height, seasonal color changes, and architectural form make tallgrasses prized for contemporary and naturalistic garden designs. They provide year-round visual interest and require far less maintenance than traditional lawns. [source]
Erosion Control & Stormwater Management
HouseholdDeep root systems (often 10-15 feet) stabilize soil, reduce erosion, and improve water infiltration. These grasses are excellent for rain gardens, bioswales, and slope stabilization without chemical amendments. [source]
Cut Flower & Dried Floral Arrangements
CraftAttractive seed heads and dried stems are popular in contemporary floral design and dried arrangements. They add texture, movement, and neutral tones to bouquets and can last for months. [source]
Biofuel & Biomass Production
MedicinalTallgrass cultivars are being researched and utilized as sustainable biofuel crops due to high yield, minimal input requirements, and carbon sequestration potential. Some cultivars can produce 5-10 tons of dry biomass per acre. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
Tallgrasses are not harvested for food but seed heads can be collected in fall (September-November) for propagation or floral arrangements. Cut seed heads when they are fully mature and dry but before winter winds scatter them. For prairie restoration, collect seeds in bulk and store dry at 32-40°F.
Fun Facts
- 🌱 Big Bluestem (Andropogon gerardii) gets its name from the distinctive three-pronged seed head that resembles a turkey foot; it was a dominant species in the tallgrass prairie that once covered 170 million acres of North America.
- 🌱 Tallgrass prairie soils are among the richest and most carbon-dense on Earth—a single square meter of prairie can store more carbon underground than a forest of the same size, making these ecosystems crucial for climate regulation.
- 🌱 Some tallgrass species have roots that extend 10-15 feet deep, allowing them to access water far below the surface during droughts and creating a living network that can survive fires, which historically swept across the prairie every 3-5 years.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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