Flower Troubles

For some reason we have some plants in our landscaping that are not doing too well. I know sometimes this happens....but the things is, it's mainly a few on one side of our home. We seem to have bugs attacking a couple of them and we don't know what or why?? Neither of have "green thumbs", but we thought it wouldn't be too hard for care to the kinds of plants we picked out. We've been watering them daily and aren't sure what's going on. Hopefully they'll perk up soon!