You don't have to be into hydroponics to find utility in these great stackable pots.  Fill them with soil and use them anywhere you would use a traditional pot!
 
Simple: Plant, Stack, & Enjoy
Made With Food Grade Plastic
Grows Flowers, Herbs, & Vegetables
Just Water the Top & All Tiers are Watered
 
Specs:
Product Dimension : 13" x 13" x 5.5"
Volume: 4.5 Quarts
Diameter: 13"
Material:  Polypropylene #5, Food Grade Plastic
Color:  Terra Cotta