Astragalus Bisulcatus Seeds – 15 Twogroove Milkvetch Native Prairie Legume

Astragalus bisulcatus, commonly known as Twogroove Milkvetch, is a native perennial legume of the North American prairies. It forms neat clumps of pinnate, gray-green leaves and sends up spikes of striking purple to violet pea-like flowers in late spring and early summer. This wildflower is a valuable addition to native plant gardens, pollinator plantings, and drought-tolerant landscapes, where its deep taproot helps it thrive in dry, well-drained soils.

Twogroove Milkvetch is prized for its ability to fix nitrogen and improve soil, making it a useful companion in prairie restorations and low-water gardens. Its compact size and attractive blooms also suit rock gardens and border edges. As a native legume, it supports bees and other beneficial insects while adding texture and color to naturalized areas.

Plant Features

• Native prairie perennial legume with purple pea-like flowers
• Drought tolerant once established, ideal for xeriscaping
• Nitrogen-fixing roots improve soil fertility
• Attracts bees and other pollinators
• Compact, clump-forming habit with attractive gray-green foliage

Growing Information

• Botanical Name: Astragalus bisulcatus
• Plant Type: Perennial wildflower
• Sunlight: Full sun
• Soil: Well-drained, sandy or rocky soils
• Water Requirements: Low to medium; drought tolerant once established
• Growth Habit: Clump-forming
• Bloom Season: Late spring to early summer
• USDA Hardiness Zones: 3-8
• Mature Height: 12-24 inches
• Spacing: 12-18 inches apart

Planting & Care

To grow Twogroove Milkvetch from seeds, scarify the hard seed coat by lightly nicking or rubbing with sandpaper, then soak in water for 12-24 hours before sowing. Sow seeds indoors 6-8 weeks before the last frost or directly outdoors in fall for natural stratification. Press seeds into the soil surface and cover lightly, as light aids germination. Keep the soil consistently moist until seedlings emerge, which may take 2-4 weeks.

Once established, this native legume requires minimal care. Water deeply but infrequently to encourage deep roots, and avoid overly rich or waterlogged soils. Deadhead spent flowers to prolong bloom or allow seed heads to mature for self-sowing. In spring, cut back old foliage to promote fresh growth. Twogroove Milkvetch is generally pest and disease resistant and thrives in low-maintenance prairie or rock garden settings.

What's Included

15 Astragalus bisulcatus seeds (Twogroove Milkvetch).