Plants have been grown too tall. I heard, there is a way to stop plants to getting taller. Does anybody know some techniques? When is good time to start to apply those techniques?
Are you requesting a way to retard the natural growth of the plant or are you looking for a way to manage the growth that is produced?
The former is not adviseable, as stress can cause a decrease in production and potency. Anything you do to stunt the growth of the plant will hurt your yields. The latter is possible through methods like LST and topping. Use the search function for more information on these topics.