They generally won't accept open feed during a flow. I'm in bama, and mine just starting. Tours should be going strong up north? When they do start taking it, they will get it down fast. I try one per week till they take it. Even light hives here won't touch it if they think the flow is on. Mine are bringing in lots of o pollen right now.
Closed feeding will work on small hive that are weak in stores. As they don't have the forage base to collect adequately collect stores. Robbing will be lessened during a flow, but not entirely eliminated. I'd do all my weak hive now if I could, to let em.grow a bit. After the flow, collect some honey, and feed well for winter.
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