One thing I noticed, the bumblebee queens are not interested in my tomato flowers. They have come for a look and then zipped off to other flowers. Tomatoes don't have any nectar to offer, just pollen. So I think these queens need the nectar as well.
Just to explain, we had a really late spring, and the first crop of worker bumbles aren't out yet. Last summer the worker bees spent a lot of time on my tomatoes, diligently collecting pollen. The queen meanwhile is out doing her thing as sole forager for their little hive until the first workers are ready to take over.
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