GreenBuddy

GreenBuddy helps you keep track of when to water your plant and keeps track of when you watered last so you don't over water.
You can add your own picture or leave it up to fate.
You can also add notes about your plant, so if there is some detail you need to keep track of its right there attached to the plant in question.
GreenBuddy has a companion Watch App that you can log your watering or fertilizing from.