Just regular pruning? I like to envision a ball in the center of the plant and clear that out, as well as maintain a splash zone clearance from the soil. It's better to prune a little ten times, as opposed to one or two big prunes, but I've done the latter and it's worked out okay. If you have a plant that loves to get powdery mildew, then you have to get really anal, maybe even trying to keep leaves from laying on top of each other. Some plants like to get super bushy and really fill in, but I always like to prune enough that I can essentially see through the plant. Also helps to not trellis all the branches in tight and use the trellis to open it up. Anyway, I think you just need to understand the basic idea, then applying it logically sorts it out. The basic idea being that air needs to be able to get in/out.




