Hi Joseph,
You have mentioned bumblebees before and it rang a bell so I just looked it up. Carolyn says, in her book:
"The most prolific pollinators are sweat bees, not bumblebees"
Now I have to go and look up sweat bees as that's a new one on me! Maybe you need a hive or two.....
Bumble bees here in NC LOVE the evergreen vine, Jessamine which blooms in the winter. I don't know where on earth you live, but your bumbles might appreciate some of that. if you're in the south It's wild and grows up the pine trees here, emitting the most amazing fragrance. Perhaps you could grow some as a winter treat for them. I have bought it in Lowes garden department.
Linda
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