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How to Grow Deerweed

Deerweed

Acmispon glaber

herb

Deerweed is a low-growing, nitrogen-fixing legume native to California and the western United States. It produces small yellow flowers and is valued for erosion control, wildlife forage, and habitat restoration. The plant is drought-tolerant and thrives in disturbed or degraded soils.

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Example Deerweed timeline · Pittsburgh, PA (Zone 6b)

  1. Plant Deerweed

    Around Apr 17

    Near Pittsburgh's average last spring frost.

  2. Tend & protect

    Late spring–summer

    Watering, feeding, and pest-watch reminders.

  3. Harvest Deerweed

    Around Jun 16

    ≈ 60 days after planting

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

Growing Conditions

☀️
Sun: Full sun, 6-8 hours daily minimum; tolerates partial shade
💧
Water: Drought-tolerant once established; water regularly during establishment (first 6-8 weeks), then minimal supplemental watering needed except during severe drought
📏
Spacing: 12-18 inches
📅
Days to maturity: 60-90 days to first flowers
🌱
Planting depth: 1/4 inch for seeds; direct sow or transplant seedlings

Soil

Type: Well-draining sandy, gravelly, or loamy soil; tolerates poor soils
pH: 6.0-7.5
Amendments:
Minimal amendments needed; thrives in depleted soils Avoid excessive nitrogen fertilization due to nitrogen-fixing capability

Growing Zones

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Thrives in zones 8b-11, best in western coastal and interior regions

8b 9a 9b 10a 10b 11a

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Growth Stages

1

Seedling

2-3 weeks

Tiny seedlings emerge with cotyledons and initial true leaves; very delicate

Keep soil consistently moist but not waterlogged; protect from heavy foot traffic; thin seedlings to proper spacing

2

Vegetative Growth

4-6 weeks

Low-growing, spreading stems develop with small pinnately compound leaves; plant becomes bushier

Establish regular watering during dry periods; no fertilizer needed; mulch lightly to retain moisture

3

Flowering

8-12 weeks or until frost

Small, bright yellow pea-like flowers appear in clusters along stems; attracts pollinators and wildlife

Reduce watering frequency; allow natural flower development; flowers support beneficial insects and wildlife

4

Seed Development

4-6 weeks after flowering

Small seed pods develop following flowering; pods mature to brown or tan color

Minimal intervention needed; allow pods to dry on plant for seed dispersal or collection; supports wildlife

5

Senescence

As season winds down

Plant gradually declines with dormancy approaching or frost arriving; foliage may yellow or brown

Allow natural decomposition; plant is typically annual or short-lived perennial in most zones; seeds persist for next season

Companion Planting

Plan your garden →

Plant with:

Desert marigold California poppy Buckwheat Lupine Coyote brush Native grasses

Avoid planting near:

Nitrogen-demanding annual vegetables Heavy-feeding ornamentals

Common Pests

  • Tolerate light damage; use row covers on seedlings if severe; remove by hand

  • Generally minor issue; remove infested seed pods; allow natural predators

  • Improve air circulation; avoid overhead watering; plant resistance varies; typically not serious

Uses

🦋

Wildlife forage and habitat

Wildlife

Provides nutritious forage for deer, elk, and livestock; seeds feed birds and small mammals. Flowers support native pollinators and beneficial insects essential for ecosystem health. [source]

🏠

Erosion control and restoration

Household

Stabilizes disturbed slopes and eroded areas while improving soil structure. Nitrogen-fixing capability helps restore depleted soils naturally. [source]

🍳

Native forage and ethnobotany

Culinary

Historically used by California Native Americans as a food source and for medicinal purposes. Young plants can be used in forage applications. [source]

🏠

Green manure cover crop

Household

When incorporated into soil, adds nitrogen naturally and improves soil fertility for subsequent plantings. Reduces need for synthetic nitrogen fertilizers. [source]

Harvest Tips

For seed collection, allow pods to brown and dry on plant, then collect by hand or cut stems and dry indoors. For forage use, cut or graze in early bloom for highest nutritional value. As a green manure crop, turn under before or at early flowering stage.

Fun Facts

  • 🌱 Deerweed's scientific name 'glaber' means smooth, referring to its hairless stems and leaves that distinguish it from related species.
  • 🌱 As a legume, deerweed forms a symbiotic relationship with nitrogen-fixing bacteria in root nodules, allowing it to thrive in nutrient-poor soils where other plants struggle.
  • 🌱 The plant is so palatable to deer that heavy browsing can keep it stunted; in protected areas it grows taller and bushier than in heavily grazed regions.

Gardening Terms

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

Annual Full Sun Green Manure Mulch Partial Shade Perennial True Leaves
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