Do they do well for a while and then start to do poorly, or do you lose them over the winter months? They do need water, but I'm sure you could overwater, very few plants like to have what is called "wet feet". If they are sitting in a water hole, they will likely suffer from root rot, which will eventually kill them. But, I have grown amazing hydrangeas in a space where I had drainage problems and never lost one. Are they getting sunshine for at least a few hours a day and is anything else growing around them? I've found that with plants, if they don't do well in one place, I don't continue to plant them there, and I move the ones that are doing poorly until I find a place they are happy in. I'm not a big fan of Lowe's plants, because they don't usually take care of them after they get them in the stores that I have shopped.. If you can get them the day they come off the truck you will usually be safe. I'm sure some stores do a much better job of that, but I have witnessed them sitting out on the parking lot and drying up over and over enough so that I do not usually buy plants there. All the same, if the plants were healthy when you bought them, they should have survived if you put them right in the ground when you got home. We had a similar problem with dogwoods when we lived in Virginia, my husband and I both love them as they are the state flower and we had a nice woodland type garden in our backyard where we planted them. After losing 7, for reasons we still do not know, my husband said, okay let's go get 3 more, and I looked at him and said "you have got to be kidding!, I know when I've been beaten!" So we gave up on dogwoods and never lost another tree. Ironically, my next door neighbor, who didn't know squat about plants, planted a dogwood in almost the exact location in his back yard, same light, same soil, same everything, and his flourished. I never understood, and I secretly held a grudge against Charlie every time his dogwood bloomed, but I didn't have the courage to try another time. So, if you think you've done everything right, you may want to pass on hydrangeas. If you think you've missed something, I would certainly keep trying. Keep me posted
