theres many methods and such to "prune" your plant. you might want to do some research on the different techniques if you choose to do so. for my recent grow i used the F.I.M method twice and love the results
i wouldnt prune either... unless you're talking about topping the plant.. if u top it once, 2 cola's will grow, once the 2 cola's grow out about 2 inches top both of those & u will get 4 cola's and so on.. i doubt ur talking about pruning the plants