Put feed on if they need it they will take it . If there's enough still coming in they usually wont
I have read this, and heard it many times from others.. I can only deduce that my bees are gluttons. It does not matter what time of year it is or what is currently flowing. If I put syrup out, they take it, and they pack EVERY available cell to the brim with it. The results are a ticked off queen that wants to swarm, or NO brood because she has no place to lay.
Having said that... Its been so dry here that most of my hives are light. They have plenty of pollen, but not much honey/nectar, so the syrup is flowing!!