I watched a female Sapyga quinquepunctata enter holes where I had recently observed much activity of males and females of Osmia caerulescens, and Osmia laeiana. I had read that this wasp only visits thyme, but when it left the hole, it ignored the nearby thyme and refuelled on the abundant forgetmenots. Meanwhile, the females of both Osmia species have begun their annual pulp making work on the hollyhock leaves. What looks like slug damage is due to bees - see photos. I haven't seen these bees visit any other plant for pulp.