Answer: Sounds like some root stress. Your crabapples should bloom every spring and all over each of the branches. If you've recently planted them, they may still be adjusting to their new homes. If they've been in the ground a while, they certainly should be established and perhaps they're not getting the water they need for good performance. If you are watering each deeply once a week, it's probably not water stress. The only other possibility is that a late freeze can sometimes kill the flower buds before they have a chance to open. Hope this information helps you troubleshoot.
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