In my yard tool shed every summer I have 4 or 5 paperwasp nests hanging there and I have found other places where there are several of these paperwasp nests close to each other. This sounds like something looking for a reason to exist to me. These paperwasps have always been very gentle and do not mind my messing around near their nests, unlike their cousins the Yellow Jackets that most often nest in the ground and are just mean and ornery.

You don't have to spray. You can make a wasp trap. First though check around the greenhouse for a nest. If you get rid of the nest you'll get rid of the wasps. To build a trap. Cut the top of a pop bottle just after where it flares out. Smear some jam on the spout and fill the bottle half full of water with a few drops of dish soap to break the surface of the water. Invert it into the bottle like a funnel and put a couple of strips of tape to hold the funnel onto the bottle and put it in your greenhouse. The wasps will fly in after the jam and fall into the water and drown. Check the trap every day and empty out any dead wasps so others can't use the dead bodies as a launching pad

My hubby went out with the pressure washer and washed them away----for a while. It didn't take long for them to come back. Meanwhile I did some research on the web and found a thread on another forum about this very subject. They were saying that once you get rid of the nest, you can spray with bleach, apparently they don't like the smell of it. You may have to do it several times. I have already done it once and they did not stick around when I tossed it on the table. I just checked and there's just one flying around out there. Think I'll get him with the swatter. He definitely won't be back then! I'll pour some more bleach out there just in case. Marg

I live in a suburban type neighborhood but with houses on only one side of the street. Accross the street from me is a big (16 acre) open park and directly next to the park is another heavily wooded area which is a county nature preserve. My neighbors have the typical no garden landscape but here I have planted heavily in fruiting shrubs like viburnum, serviceberry, shrub dogwoods, Winterberry, blueberries, and many others that attract backyard songbirds. I have no bluebirds and no tree sparrows have ever come to my nestboxes although I do see them flying overhead. Although I have had the male wren building fake nests for 4 years, last year was the first year he found a mate and they fledged two broods. That year the chicadees were nesting less than 20 feet away from the wrens. They never bothered each other. This year the wren is nesting in the front yard in a slotbox house that is very near my blackberries. The chicadees are in the backyard in a box very near my old cherry tree. The nestboxes are not in sight of each other but really they are not that far from each other either as I do not have a huge yard. House wrens apprear to be rare here. It was years of me planting shrubs to make the yard more attractive to sonbirds before I ever saw a wren here. I know that this is not a polular opinion here on the bluebird forum but I really like the house wrens.