I second the buckwheat. In my experience ; it will germinate with only 2x rains of 1/4 inch, and it needs very little rain after that. The bees will work it when it is humid and early in the morning when there is dew.
Eventually I will be using buckwheat but my cultivating equipment is extremely limited currently and native species are currently of greater interest. I do have lots of mint (species not known) and think it supports bees after white sweet clover flow dries up.
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