There are a couple of things, mimic the fall. You can lower the temperature, and humidity, depriving of water can be good and bad, can make the plant produce more resin,but could make the leaves and buds a little dry.if it could work, I try it, I do a 48 hour dark period at the end. Also you can use a bud sugar up until you harvest, also look into bud finishers, there are products meant to help flushing as well