I think most areas go through a dearth at some point. Winter being the longest for most It's important to remember that seeing flowers and them producing nectar aren't always the same thing. In my area the flow has pretty much stopped at some yards and is just trickling at others. The regular rain has kept it going longer this year. With goldenrod not far off there may not be much of a dearth this year.
I think it depends on rain fall. Where I live, other than the 9 months of winter (other 3 we have poor skating), we occasionally get a dearth in August due to lack of rainfall (about 1 year in 5). Regarding purple clover; I have been told that it hard for bees to utilize due size of the flowers//second cut is better as the flowers are smaller.
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