I have at least 20,000 sqft of clover. Field behind has mustard green with yellow tops. There having a field day. I seen what I thought was a comb on one of my trees. There was 10x as many as I got in the mail. I suited up got the smoker going and walk out there. It was gone before I could get back. They where just getting the sap out of the tree. So, I really think I am picking up extra bees from some where.