Rotation of sunn hemp with corn is used to control worms in Hawaii. Since sunn hemp is resistant to nematodes, it is advantageous to grow it in rotation with nematode-susceptible crops. The extremely rapid early growth of sunn hemp enables it to shade out weeds very effectively. Probably seed production is more difficult in the subtropics than in the tropics. In the tropics, flowering can begin at six weeks, with maturity reached at four months or more.
Seeds remain viable for a number of years.
Evaluation of seed production in south Florida is in progress.