Sow from April to mid-August. This is a simple combination of the two most reliable and vigorous annual clovers. Ideally give three months of good growing weather to reach optimum biomass and nitrogen fixing benefit. Once established, they create strong roots and are considered drought tolerant. Biomass can be grazed or mulched. The flowering crop looks impressive and provides a good nectar source. Neither are hardy, but Crimson Clover can survive UK winters.