I like to harvest scion wood in early Spring BEFORE it has its first growth flush. Keep in fridge in ziplock with damp paper towel until your rootstock bark is slipping.
This way, your scion wood has lots of good still dormant buds to chose from.
But again, I don't know your particular situation. Are you talking about indoor plants? Outdoor plants?
Need more data from you.
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Annandale, VA
USDA Zone 7A