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We call those suckers.
Time To Prune. The best time to prune a crabapple tree is when it is dormant or “sleeping” which would be in the late winter and early spring. Make sure to prune before the new foliage starts to grow in.
If you are not exactly sure as to when to prune, it is best if you wait a little longer, until the severe cold and frost are over with but before you see the first new green on the branches.
Dec 23, Most, if not all, new hybrid crabs bloom annually, but older trees may or may not bloom every year. The best time to prune your trees is in late winter or early spring before the leaves appear as it is much easier to see which branches should be removed and also gives the trees the entire spring and summer to form new growth.