My sister says that when she shops at a plant nursery, she looks for plant labels that say things like "Thrives on neglect." I've been experimenting with that style of gardening this summer. My plant care regimen has consisted of watering my plants just often enough so they don't die. I can say that petunias, in particular, do indeed thrive on such neglect. My heliotrope is also looking surprisingly well. The nicotiana tend to wilt between waterings, but then they are in pots slightly too small for them.
Some weeds growing up between the paving stones are also looking lush.