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How to Grow Kanlow Switchgrass

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Kanlow Switchgrass

Panicum virgatum 'Kanlow'

grass

Kanlow is a cultivar of switchgrass, a native North American perennial grass prized for its biomass production, ornamental appeal, and ecological benefits. It grows 5-7 feet tall with fine-textured foliage that turns burgundy-red in fall and produces delicate seed heads. This cultivar is particularly valued for biofuel production and erosion control while supporting wildlife habitat.

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Example Kanlow Switchgrass timeline · Pittsburgh, PA (Zone 6b)

  1. Plant Kanlow Switchgrass

    Around Apr 17

    Near Pittsburgh's average last spring frost.

  2. Tend & protect

    Late spring–summer

    Watering, feeding, and pest-watch reminders.

  3. Harvest Kanlow Switchgrass

    Late summer into fall

    Before the first fall frost (≈ Nov 8)

Sample dates for Pittsburgh, PA. Sign up to get exact Kanlow Switchgrass dates for your own zip code.

Growing Conditions

☀️
Sun: Full sun, 6+ hours daily; tolerates partial shade but performs best in full sun
💧
Water: Moderate; drought-tolerant once established. Water regularly during establishment year (first 12 months). Mature plants need minimal supplemental watering except in severe drought.
📏
Spacing: 24-36 inches
📅
Days to maturity: 2-3 years to reach full productivity; initial growth visible in first year
🌱
Planting depth: Surface sow or barely cover seeds; press into soil for contact. Transplants: plant at same depth as nursery container.

Soil

Type: Well-draining loamy to sandy soil; tolerates poor and marginal soils
pH: 5.5-7.5
Amendments:
Compost for poor soils Sand for heavy clay to improve drainage Minimal fertilizer needed once established

Growing Zones

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Thrives in zones 4-9, with best performance in zones 5-8

4a 4b 5a 5b 6a 6b 7a 7b 8a 8b 9a

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Growth Stages

1

Germination & Seedling

3-4 weeks to visible seedling stage

Seeds germinate in 7-14 days under warm conditions (65-75°F). Seedlings emerge with fine, linear leaves and develop slowly in first season.

Keep soil consistently moist but not waterlogged. Provide light; seeds need exposure to light for germination. Thin seedlings to proper spacing. Protect from foot traffic.

2

Establishment

Months 2-12 of first growing season

First year focuses on root development rather than top growth. Plants reach 1-2 feet, developing rhizomes and establishing deep root systems.

Water deeply and regularly during dry periods. Minimal fertilizer needed; avoid high nitrogen. Weed control is critical in first year. Do not harvest or cut back.

3

Vegetative Growth

Spring through mid-summer, Seasons 2-3

Years 2-3 show rapid above-ground expansion. Plants reach 4-7 feet tall with dense clumping growth and fine-textured foliage. Rhizomatous spread develops.

Allow full growth; do not cut during growing season. Cut back to 3-4 inches in late fall/early spring (February-March). Minimal supplemental water once established.

4

Flowering & Seed Head Formation

8-10 weeks (late August through October)

Late summer to fall, delicate, open panicle seed heads emerge above foliage (August-October). Foliage transitions to reddish-burgundy color. Seeds mature but are not viable for most uses.

Do not remove seed heads during growing season; they provide visual interest and wildlife food. Allow seed heads to persist through winter for landscape and ecological value.

5

Dormancy & Harvest

November through early March

Winter dormancy; above-ground growth dies back. Plant persists via extensive rhizome system underground. Dried stems remain standing.

Cut back in late winter (February-March) before new growth emerges. Remove all dead material. Biomass harvest occurs at this time for energy/fuel applications. Do not cut during growing season.

Companion Planting

Plan your garden →

Plant with:

Black-eyed Susan Purple coneflower Bee balm Blazing star (Liatris) Wild bergamot Little bluestem Asters Goldenrod

Avoid planting near:

Aggressive spreading rhizomatous plants (except other compatible native grasses) Shade-casting large trees Moisture-demanding plants in poorly-drained areas

Common Pests

  • Generally not a significant problem; natural predators manage populations. Remove by hand if severe. Neem oil or insecticidal soap for severe infestations.

  • Rare on mature plants. Monitor seedlings; use Bacillus thuringiensis (Bt) or spinosad if larvae appear on young plants.

  • Uncommon; manage with beneficial insecticides or neem oil if populations spike.

Uses

🍳

Not for consumption

Culinary

Kanlow switchgrass is not edible and is not used for food or beverage production. It is grown for biofuel and agricultural purposes only. [source]

🏠

Biofuel & Biomass Production

Household

Kanlow is a premier cultivar for biofuel production, with high cellulose content and robust yields. It is processed into ethanol and biogas for renewable energy generation, serving as a sustainable alternative to fossil fuels. [source]

🏠

Erosion Control & Soil Stabilization

Household

Extensive rhizome systems and deep roots stabilize soil, reduce erosion, and improve soil structure. Used extensively in conservation programs, riparian buffers, and degraded land restoration. [source]

🦋

Wildlife Habitat & Pollinator Support

Wildlife

Provides dense nesting cover for grassland birds, seeds for wildlife food, and structural complexity that benefits pollinators, beneficial insects, and small mammals. Creates valuable habitat in agricultural and restored ecosystems. [source]

🎨

Ornamental Landscaping

Craft

Valued in native plant gardens and modern landscapes for its graceful form, fine texture, and striking burgundy-red fall color. Seed heads add winter interest and movement in the landscape. [source]

Harvest Tips

Kanlow is primarily harvested for biomass in late winter (February-March) after frost, when moisture content is lowest and energy content is highest. Cut stems 2-3 inches above ground using a brush cutter or hay equipment. For ornamental use, leave seed heads standing through winter for visual and wildlife value; cut back in early spring before new growth. Do not harvest during growing season (May-September) as this weakens the plant.

Fun Facts

  • 🌱 Kanlow switchgrass can produce 5-15 tons of dry biomass per acre annually, making it one of the most productive perennial energy crops; a single plant's root system can extend 10-12 feet deep into the soil.
  • 🌱 The cultivar 'Kanlow' was specifically selected and named by the USDA for superior biomass yield and winter hardiness; 'Kanlow' refers to its origin from Kanlow, Oklahoma.
  • 🌱 Switchgrass is a warm-season C4 grass that continues growing when cool-season plants slow down, and it thrives on marginal agricultural land unsuitable for food crops, making it a climate-smart biofuel solution.

Gardening Terms

New to gardening? Learn about terms used in this guide:

Cultivar Full Sun Germination Partial Shade Perennial
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