There was an article written up a few years ago about this subject and flowers. It caused a great deal of skepticism in horticulture circles. Personally I have not tried it my self nor would I ever. What I do know is Alcohol will dry out the roots and the plant can’t absorb all the alcohol properties. The little hairs will pull back and nutrient uptake is reduced. Now it could be used as a stress technique very late in flower that may be possible. Some feel that stressing the plant late in flower can produce female seeds and may increase THC. Personally I prefer the stress free growing you have less problems and a better overall quality. I can’t remember where I found that article but if you Google it you may find it.

Make up your own mind.