How do you determine the right time to graft plums?

Three weeks later it looks like 13 of the grafts are just starting to leaf out and 2 are likely failures. Tomcot apricot on Shiro plum is doing okay so far, not sure how long it takes graft incompatibility to become apparent.

Decided to remove the foil because the next few days are supposed to be rainy / overcast with a High of high 60s and a Low of high 40s. Figure the graft union should be healed enough by now to avoid drying out.

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