Weed killer

What kind of weed killer can you put on a vegetable garden in the fall so it won't affect the spring planting? We live in North Florida.

Thanks, JC

Anne's response:

Round-up will kill weeds but not be persistant in the soil so it is safe to use on vegetable gardens. I prefer to till weeds into the bed before they go to seed and cover the area with a layer of leaves or compost to keep weeds from sprouting over the winter.