Birdsfoot Trefoil (Lotus corniculatus) - How to Grow & Care Guide

Plant Snapshot

Common Name: Birdsfoot Trefoil
Latin Name: Lotus corniculatus
Hardiness Zones: USDA zones 3–9, tolerates cold winters but growth is slower in cooler zones and may die back; in warmer zones it can persist year round and spread by seed
Typical Height: 4–16 in (10–40 cm)
Typical Spread: 8–24 in (20–60 cm)
Bloom Period: Late spring to summer (typically May–August in the Northern Hemisphere)
Soil Preferences: Prefers well drained, neutral to slightly acidic soils but tolerates poor, dry, sandy or gravelly soils; waterlogged soils are problematic
Light Preferences: Full sun to light shade; best flowering and vigor in full sun
Toxicity: Generally used as forage and described as non-bloating; some literature notes potential for cyanogenic compounds or other issues under stress so verify for grazing use
Propagation: By seed or division; seed benefits from proper seedbed and sometimes scarification and rhizobial inoculation for best establishment

Key Facts

Perennial low-growing legume that forms mats or loose clumps
Produces clusters of yellow to orange pea-like flowers
Used as forage and for soil improvement because it fixes nitrogen
Tolerates poor, dry soils better than many other legumes
Spreads by seed and can naturalize outside its native range
Does not cause bloat in ruminants like some other forage legumes
Responds well to full sun and open sites

Birdsfoot Trefoil is a low perennial legume that forms mats or loose clumps and produces clusters of yellow to orange pea-like flowers. It is valued for forage and soil improvement because it fixes nitrogen and tolerates poorer, well drained soils.

Identification

Plants stay low, typically 4 to 16 inches tall and forming mats 8 to 24 inches across where established. Leaves are pinnate with several small leaflets and flowers appear in small clusters of yellow to orange pea-type blooms. The low habit and clustered pea flowers make it distinct among pasture and meadow legumes.

Where to grow and best uses

Best used as a forage legume, soil-improving groundcover, or low meadow component in full sun to light shade. It tolerates poor, dry or sandy soils better than many legumes and is useful on lean sites where other legumes struggle. Avoid waterlogged sites because poor drainage reduces vigor.

Planting and spacing

Establish from seed or division. Space plants or seed to allow colonies to form about 8 to 24 inches apart because established plants spread by seed and create mats 20 to 60 cm across. Prepare a firm, well drained seedbed and follow supplier guidance on scarification or inoculation for best establishment.

Soil, light and watering

Prefers well drained, neutral to slightly acidic soils and performs best in full sun. Once established it tolerates dry, poor soils and shows reduced growth in heavy shade. Avoid overwatering and poorly drained sites because waterlogging leads to decline and poor persistence.

Bloom and after-flowering care

Blooms in late spring through summer, typically May to August in the Northern Hemisphere. For forage cut for hay or graze according to local recommendations. Mowing before seeds mature reduces natural reseeding while allowing some seed set encourages naturalizing and patch expansion when that is desirable.

Controlling spread and naturalizing

Birdsfoot trefoil spreads by seed and can naturalize outside its native range, so monitor reseeding in sensitive sites. Remove seed heads or mow before seeds mature to limit spread and pull out young seedlings where containment is needed. Planting in intended areas and regular management reduces inadvertent spread.

Propagation

Propagate by seed or division. Seed establishment benefits from a prepared seedbed; some sources recommend scarification of hard seed coats and inoculation with compatible rhizobia when sowing into soils without a history of Lotus species to improve nitrogen fixation and establishment.

Livestock and safety

Used commonly as a non-bloating forage legume and valued for pasture. Some literature notes that stressed legumes can produce cyanogenic compounds in unusual conditions, so verify grazing safety with local extension or poison control before planting for heavy livestock use.

Frequently asked questions

How fast does Birdsfoot Trefoil grow?: Growth rate varies by climate and soil. It typically establishes a low mat during the first growing season in suitable conditions and expands by reseeding to form colonies that commonly span 8 to 24 inches where established.
What hardiness zones does it tolerate?: Reported hardiness is roughly USDA zones 3 to 9. Colder zones show winter dieback with slower regrowth while warmer zones favor persistence and increased reseeding.
Can it be used on poor soils?: Yes. It tolerates poor, dry and sandy soils and is often chosen for lean sites, provided the soil drains well and is not waterlogged.
Will it cause bloat in livestock?: Birdsfoot trefoil is described as a non-bloating forage legume, but check local extension guidance because some stress conditions can alter plant chemistry and pose risks in unusual situations.
How do I stop it spreading?: Prevent seed set by mowing or cutting before seeds mature and remove seedlings around plantings. Regular management and timely cutting reduce unwanted naturalizing.