Sumac is just now starting and clover will last as long was we get some rain every three or four days. Also some sourwood trees at lower elevations will produce nectar which would get mixed in with the clover/sumac. I would wait but not add a large honey super just a shallow body if they are out of room. Also if they have popped a swarm that you missed they will slow way down and your hive is done for the summer.
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