what are they doing in my plant trays?
Over the last 10 days or so, either yellow jackets or some kind of bee have been settling into the planted trays and pots I have in my garden. There are plenty of open areas in the garden itself for them to accumulate, but their preferences are 1-the individual cells within one divided tray; 2-a larger tray with no cells; 3-a round container. All are black plastic. The critters land on the various surfaces and seem to be attending to the soil (sterile potting mix) in each. They stay quite a while, particularly in the afternoon. They don't seem to be attracted to the seedlings in the trays. So, what are they up to? Thanks!