Jacquesverlaeken / CC BY-SA 4.0
Crimson clover
Trifolium incarnatum
Overview
A stunning cover crop that produces cone-shaped crimson flower heads so vivid they look painted, beloved by gardeners and farmers alike. Crimson clover fixes substantial nitrogen in the soil while providing one of the most beautiful cover crop displays imaginable. It's a cool-season annual that winter-kills in cold climates or can be mowed before setting seed in milder areas.
Crimson clover, with its vibrant red flowers and distinctive tri-leaf design, is a stunning addition to any garden. A member of the Fabaceae family, this herbaceous perennial hails from the rich soils of Eurasia.
Appearance and Distinguishing Features
The star of the show is crimson clover's radiant flowers, each bloom a deep, velvety red that illuminates the landscape. The leaves are composed of three oval-shaped leaflets, arranged on a central stem. This visual symphony not only captivates the eye but also offers a delightful contrast against its green foliage.
Native Range and Habitat
Originally from Eurasia, crimson clover has naturalized across many regions, thriving in temperate climates. It's at home in meadows, pastures, and open woodlands, where it can bask in full sun to partial shade.
Growing Conditions and Care
Crimson clover is a low-maintenance gem that prefers well-draining soil rich in organic matter. While it tolerates various soil types, its preference for slightly acidic to neutral soils ensures optimal growth. Watering during dry spells keeps this plant content, but once established, it's drought-tolerant, making it a resilient choice for any gardener.
Uses
Crimson clover is not just eye candy; its leaves and flowers are edible, offering a subtle sweetness in salads or as garnish. Historically, the plant held significance in traditional medicine, though modern research is limited due to its lesser-known status.
Ecological Significance
Its ecological impact is profound, acting as a cover crop that enriches soil health through nitrogen fixation. Moreover, it provides sustenance for pollinators and other wildlife, making it invaluable in conservation efforts.
Cultural or Historical Significance
In some cultures, crimson clover holds symbolic importance, often associated with passion, love, and the essence of summer. Its deep red hue has even inspired artists and poets through the ages.
Notable Varieties or Related Species
While T. incarnatum remains a beloved classic, other Trifolium species offer variety within the family. White clover (T. repens) and red clover (T. pratense) are notable relatives, each contributing its unique charm to landscapes worldwide.
Growing Conditions
Habitat & Range
- Habitat
- Forest Edges & Thickets
- Native Range
- Native to Alberta; also native to Austria, Belgium, Bulgaria and 26 more regions; introduced in 38 US states
- Cultivation Region
- Temperate regions
Botanical data via projectGAIA.
Companion Planting & Soil
Good Companions
Sowing & Propagation
Propagation Methods
Planting Calendar
When to sow, transplant, and harvest by growing zone.
| Zone | Action | Months | Notes |
|---|---|---|---|
| Cold (1-2) | Direct Sow | May — Jun | Direct sow as spring cover crop; annual legume; nitrogen fixer; crimson flowers |
| Cold (1-2) | Direct Sow | Aug — Aug | Late summer sow; may winterkill in zones 1-2 — provides dead mulch |
| Cool (3-4) | Direct Sow | Mar — Apr | Spring sow for summer green manure; or fall sow for overwintering |
| Cool (3-4) | Direct Sow | Aug — Sep | Fall sow; overwinters in zone 4+ with snow cover |
| Moderate (5-7) | Direct Sow | Sep — Oct | Fall sow; overwinters and blooms in spring; mow before seed set to terminate |
| Moderate (5-7) | Harvest | Apr — May | Mow or till in at early bloom stage 2-3 weeks before planting cash crop |
| Warm (8-9) | Direct Sow | Sep — Nov | Fall sow; excellent winter cover; fixes 70-150 lbs nitrogen per acre |
| Warm (8-9) | Harvest | Mar — Apr | Terminate at peak bloom; let decompose 2 weeks before planting |
| Hot (10+) | Direct Sow | Oct — Dec | Fall/winter sow; stunning red blooms in spring; great bee forage |
Uses
Culinary
- Flowers are edible and make beautiful salad garnishes
Other Uses
- Nitrogen-fixing cover crop (80-150 lbs N/acre)
- Stunning ornamental ground cover
- Premier early-season bee and pollinator plant
Safety Notes
ducing allelopathic chemicals (chemicals that are toxic to other plants). An Ohio study found that using barley as a cover crop suppressed yellow foxtail ( Setaria glauca ) emergence by 81% (Creamer et al., 1996a).
