When some sort of virus almost wiped out all my plants including my 3 overwintered plants which were starting to produce at the time, I chopped them right back to stumps and just left them in the garden, then they started putting out new growth I though I'll use them as bonsai experiments (pretty boring straight trunks) maybe learn something from them, and start some plants next season for the specific purpose of turning them into bonsai i.e. Train the stems and branches as it grows through the season