food plot question

[BUFF]

I have 3 acres of purple hull peas planted in the creek bottom for a food plot. The deer have been waring them out all summer. do I need to disc them under and replant for a fall plot or will they continue to produce until they get hit with a frost?
http://www.buffsblackwidow.com/images/food1.JPG

http://www.buffsblackwidow.com/images/CDY_0001.JPG