A better way to stress your plants would be to add salicylic acid, It is the trigger chemical that tells the plant that it is being attacked, and puts the plant in to stress with no damage at all.
WildFire.ca Reviewed by WildFire.ca on . pinching the the tips of leaves? just like the title says has any one heard of this technique? "Another still-experimental process to increase the resin it to pinch off the leaf tips as soon as they appear from the time the plant is in the seedling stage on through its entire life-span. This produces a distorted, wrecked-looking plant which would be very difficulty to recognize as marijuana. Of course, there is less substance to this plant, but such wrecked creatures have been known to produce so much resin that Rating: 5