A house I used to live at had a few perennial bushes of Speedwell (Veronica). I can't remember the name of the variety but it was one that had won awards for being in bloom much of the summer if you occasionally clipped off the over-mature flower spikes. The bumblebees would cover the thousands of little flowers so thickly that you sometimes could scarcely see the flower color.
I'd also read elsewhere that your cucurbits, especially the ones with larger flowers, attract bees from quite far away, which is why they apparently need long isolation distances to avoid cross-pollination.
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