Drought Tolerance: Medium High
Winter Hardiness: High
Yield Potential: Medium
Grazing Tolerance: High
Alone (lbs./acre): 8-10
Mixes (lbs./acre): 4-5
Depth (In.): 1/4
Emergence (days): 7
Life Cycle: Perennial
Soil pH: 6.0-6.5
Birdsfoot Trefoil is most productive in fertile, well drained soils with a close to neutral pH. However, Birdsfoot Trefoil can be grown on low pH (5.5) soils with low fertility and will tolerate short periods of flooding better than alfalfa. It can tolerate periods of drought and is more suited to soils prone to heaving. Alfalfa will outproduce Birdsfoot Trefoil by 50-80% on well drained, fertile soils, limiting birdsfoot trefoil to areas where alfalfa is difficult to produce.
Birdsfoot Trefoil should be inoculated before planting to ensure sufficient nodulation of the root system for nitrogen fixation. A smooth, firm seedbed is recommended. Seeding depth should not be more than ¼ in. Early spring seeding is generally more successful than late summer seeding.
When harvested for hay, first cutting should be taken at 1/10 bloom with second cutting mid-late Aug. To maintain birdsfoot trefoil stand, use management system providing sufficient regrowth between cuttings, allowing plant to reseed itself.
Heavy grazing may be needed in spring to reduce growth but close continuous grazing is not recommended since summer regrowth depends on energy supplied by top growth, not root reserves like alfalfa. Leave 3-4 in. of top growth when grazing. Avoid haying or grazing between Sept. 1 and first killing frost so root reserves accumulate for better winter survival and spring growth. Birdsfoot Trefoil is well suited for stockpiling since it maintains its leaves at maturity and after frosts. It responds to proper fertility management which should be determined by soil testing.
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