A cool season grass should also be seeded with it. Sweet clover contains a high percentage of hard seeds that persist in the soil for many years. This accounts for its consistent volunteering in many areas. The same strains of bacteria that are used to inoculate alfalfa will inoculate sweet clover. Diseases and insects Sweet clover is usually considered more resistant to diseases than red clover.
Insects are troublesome to sweet clover.
In particular, it is susceptible to the sweet clover weevil. This weevil is probably a major reason sweet clover is not used more widely. Complete loss of new seedings due to feeding by adult weevil is not uncommon in areas where much sweet clover is grown. Second-year stands may be damaged, but the stand seldom is destroyed. About the only control for sweet clover weevil is the use of insecticides.