This may be the result of improper pruning (at the wrong time) or unseasonably cool weather affecting the buds on the branches. The correct time to prune Cassia is AFTER blooming, never before. Wait until your cassia has finished blooming, if it does, then immediately prune it back by about a third or so. Follow up with fertilizer and water and it should bounce right back with plenty of fresh growth all over the tree.
Answered on June 17, 2015
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