COLLECTING SCIONS - do this as close to the day of the exchange as possible. The longer the scions are off the tree, the less probability the grafts will take.
YOUNG WOOD - look for last year’s growth on the tree. No more than pencil size width. Too fat and it's hard to close the split, too narrow and it's weaker and has less cambium area to connect. (Click for more about the cambium) Cut a 6-8” piece. Try to get at least 4-6 buds. Make sure it is healthy with no dead or diseased spots. Be sure to cut just above a bud so the tree will sprout new growth.
LABEL SCIONS - wrap the individual scion, or a bundle of them with blue painter's tape, (or a weak masking tape), and write the name and variety on the tape -- Golden Dorsett Apple, Santa Rosa Plum. If you do not know the name of the variety, some people will not want to graft it onto their tree. However, if you don't know the variety and you can say it is the most incredible and prolific peach you’ve ever tasted, you might get some takers.
BAG the SCIONS - hopefully you’ve cut and collected and labeled these the night before or the day of an exchange. Don’t let them sit long. Put the lower ends of the scions, (buds facing upwards) in a damp paper towel and put them in a plastic bag, in the fridge.
At the scion exchange bring:
Bagged and labeled scions. Empty bags to collect new scions. Masking tape for labeling Sharpie Damp paper towels
Take only what you'll use. A 6-8 inch scion can supply two to three pieces for grafting.