THE CANNABIS GROW BIBLE
by Greg Green
When you harvest your bud you will have trimmed the leaves away from the bud. This trim is what we refer to as Skuff. Skuff should be sticky. So whether it is on the stem or branch or leaf or bud, if it feels sticky then you can use it to extract the resin. Now if you really want to be a connoisseur about this then you should examine your skuff for trichomes with a microscope. If any parts of the skuff do not have trichomes then discard them. You must take this trim and store it much the same way as you would canned bud for 3 to 6 weeks.
Also the quality of the overall result can not be much better than the genetics that you started with in the first place. If you used plants that where not very potent then dont expect to produce very potent hash from them.