you can reveg any plant after harvest. First, chop it down to the lowest two or three branches. Second, if your in dirt re-pot it. Third, cut down the amount of water you are giving it to about 1/3rd. The plant still has a massive root system to support all those leaves and buds that where on when you harvested. If it gets too much water it will just plop over and be dead cause theres so much damn water in the stalk and branches =o(

If your in a hydro setup, pull your basket up and cut a grip of the roots off the bottom of it and find a way to limit the amount of water getting to the roots so your plant dosent suicide it LoL It took one of my brothers plants two weeks to show any growth what so ever but the rest of them usually start growin after a couple days.

Peace