I read your article, Ed’s Swiss trip (CC#20, October 1999), about how your friend extracted finger hash by rubbing the leaves for their resins prior to harvest. How soon after a plant’s photoperiod is flipped can you do this? Does this have any effect on the quality of yield once the plant is harvested?
The plant’s production of glands containing cannabinoids increases substantially about halfway through the flowering cycle. Rubbing the leaves probably injures them a little bit, but when it is done gently, they seem to recover well. In at least some varieties, the glands that have been removed seem to grow back so the same leaves can be rubbed again later in flowering.
I don’t know if rubbing the plants affects the yield of buds. It might, because the leaf tissue is wounded by the rubbing and must take time to repair itself. However, this might also stimulate growth. In studies of tomatoes it was found that agitating the plants produced more vigorous vines.
Readers with grow questions (or answers) should send them to Ed at: Ask Ed, PMB 147, 530 Divisadero St., San Francisco, California 94117, USA. You can also email Ed at [email protected]lture.com, and send queries via his websites at www.ask-ed.net. All featured questions will be rewarded with a copy of Ed’s new book, Best of Ask Ed: Your Marijuana Questions Answered. Sorry, Ed cannot send personal replies to your questions.