Alfalfa has a wide range of recommended seeding dates. In the Upper Midwest, alfalfa fields can be seeded anytime from mid-April through May. Early June for northernmost dairy regions is fine. ... Seeding too early in conditions that are too cold delays seedling emergence and potential stand density.

Can alfalfa reseed itself?

Alfalfa is a crop that naturally tends to lessen its density over time because alfalfa doesn't reseed itself. Planting more alfalfa into current alfalfa fields is not recommended since alfalfa has autotoxicity characteristics. A good population/density is about 35 well-growing stems per square foot.

Can you seed alfalfa on alfalfa?

Seeding alfalfa after alfalfa is high risk. Old stands of alfalfa release a toxin that reduces the germination and growth of new alfalfa seedlings. This is called “alfalfa autotoxicity”. Establishment problems can result if the existing stand was not plowed or sprayed at least 3 weeks before reseeding.