Plant Purrfect Self-watering Plant Pot (White) Self-watering system, guage shows when to add water at a glance Spill resistant, no leaking, water every 2-4 weeks Accepts standard nursery pots 3.5"-4.5" diameter (4" pot included) Buy a plant...drop it in! Plant takes only as much water as it needs Uses: indoor plants, seed starting, hydro culture, plant cloning and horticulture