Crimson clover (Trifolium incarnatum L.)
Crimson clover is a cool season annual legume, used as forage, soil conservation, and as a green manure crop. Crimson is easily established and will tolerate colder temperatures than other clovers, and will perform on soils with pH ranges from 4.8-8.2, suggested pH is between 5.8-6.5. It should be established six weeks prior to frost. In no-till application, crimson clover is used primarily for soil cover and nitrogen fixation; having the ability to provide from 70-130 lbs of N for the following crop.
Seeding Dates: Southern US: Sept-Oct    Midwest: Mid Aug- Mid Sept
Seeding Rates:  Drill - 12-15 lbs/ac
                                  Broadcast - 15-18 lbs/ac
Seeding Depth: 1/4-1/2"
Notes: Need to inoculate prior to seeding. Crimson clover is a host for the soybean cyst nematode. Good early spring N production, can winterkill some years, more research needed.

Crimson Clover
Crimson Clover - Michigan Cover Crop Species