How to Grow Hedysarum
Hedysarum
Hedysarum species
herbHedysarum is a genus of flowering perennial and annual plants in the legume family, known for their attractive spikes of small pea-like flowers in shades of pink, purple, red, or white. These plants are drought-tolerant, nitrogen-fixing, and valued both as ornamental flowers and as nutritious forage for livestock and wildlife. Several species, particularly Hedysarum alpinum, have been traditionally used as food and medicine in Arctic and boreal regions.
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Example Hedysarum timeline · Pittsburgh, PA (Zone 6b)
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Plant Hedysarum
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 Hedysarum
Around Jun 26≈ 70 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Hedysarum dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 3-7, with excellent cold hardiness; some species hardy to zone 2
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Get my Hedysarum timeline →Growth Stages
Germination & Seedling
2-4 weeksSeeds sprout within 1-3 weeks. Seedlings develop cotyledons and small compound leaves. Plants grow slowly initially.
Keep soil consistently moist but not waterlogged. Provide bright light if starting indoors. Thin seedlings to proper spacing once true leaves appear. Cold stratification (4 weeks at 35-40°F) improves germination rates.
Vegetative Growth
4-8 weeksPlants develop a bushy form with compound pinnate leaves. Root system deepens. No flowering yet.
Reduce watering frequency as plants mature. No fertilizer needed due to nitrogen-fixing ability. Pinch back early growth to encourage bushiness if desired. Mulch lightly to retain soil moisture.
Budding & Flowering
6-12 weeksFlower buds form along central spikes. Small pea-like flowers appear in dense racemes in pink, purple, red, white, or bicolor patterns.
Maintain moderate watering during flowering. Deadhead spent flowers to encourage prolonged blooming. Support tall varieties with staking if needed. No additional fertilizer required.
Seed Development & Maturation
4-6 weeksFlowers fade and pods develop along the spike. Pods mature and dry on the plant, turning brown or tan. Seeds accumulate.
Allow pods to mature and dry on the plant for seed collection. Reduce watering. Leave some spent flowers for seed production if collecting seed.
Dormancy (Perennials)
4-6 monthsPerennial varieties die back to the root crown in fall/winter, then regrow in spring. Annual varieties complete their life cycle.
No watering needed for dormant perennials. Do not prune back until spring growth begins. Mulch around plant base for winter protection in cold zones. Expect vigorous regrowth and more flowers in year 2.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Spray with water to dislodge; use insecticidal soap; encourage natural predators like ladybugs
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Increase humidity; spray with neem oil or horticultural oil; prune affected foliage
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Improve air circulation; remove affected leaves; apply fungicide if severe
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Ensure excellent drainage; avoid overwatering; remove affected plants; use well-draining soil
Uses
Edible Roots & Forage
CulinaryHedysarum alpinum (Arctic hedysarum) roots have been consumed by Indigenous peoples and northern communities for millennia, with a sweet, starchy flavor. The entire plant also serves as nutritious livestock and wildlife forage. [source]
Traditional Medicine
MedicinalVarious Hedysarum species have been used in traditional Chinese medicine and Arctic indigenous medicine to support immune function and overall wellness. The plant is rich in polysaccharides and other bioactive compounds. [source]
Pollinator & Forage Support
WildlifeHedysarum flowers attract bees, butterflies, and other pollinators. The nitrogen-fixing legume also provides excellent forage for deer, moose, and other wildlife, making it valuable for habitat restoration and wildlife gardens. [source]
Cut Flowers & Garden Display
OrnamentalThe attractive flower spikes last well in fresh flower arrangements and provide long-season color in perennial borders and native plant gardens. Excellent for cottage gardens and alpine settings. [source]
Erosion Control & Soil Improvement
HouseholdAs a nitrogen-fixing legume, Hedysarum builds soil fertility naturally, enriching depleted soils while stabilizing slopes and preventing erosion. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
For flowers: Cut spikes when most flowers have opened but some are still in bud, early morning for best quality. For seeds: Allow pods to fully mature and dry on the plant; collect when brown and papery, typically in late summer to early fall. Strip seeds from pods by hand or rubbing between palms. For forage (livestock): Cut when in early flowering stage for maximum nutrition.
Fun Facts
- 🌱 Hedysarum alpinum roots were so valued by Arctic explorers that they were called 'Eskimo potatoes' and formed a crucial part of traditional diets in the Far North for thousands of years.
- 🌱 Like all legumes, Hedysarum forms symbiotic relationships with nitrogen-fixing bacteria in root nodules, allowing the plant to thrive in poor soils and naturally enrich the soil for neighboring plants.
- 🌱 The genus name 'Hedysarum' comes from Greek words meaning 'sweet' and 'scent,' though the flowers are more valued for their visual beauty than fragrance.
Gardening Terms
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