Since I like to be kind to plants, I have a general policy of not owning them. Unless they are cut flowers or plants I will be ingesting later that evening, the only way I "take care" of plants is the way the mafia "takes care" of their enemies.
But since I'm trying to fight my black thumb, I'm going to give plant care and feeding another shot, and I'll do it with the help of Botanicalls. Botanicalls provides plants that through a sensor-microconnector situation that makes this geek's brain hurt (just read the description), eventually call you to tell you that it needs watering.
The very best part? The plants have awesome voices and messages you can listen to here. Even if you're not interested in buying one of their plants, just give it a listen for a giggle.