Deepot Support Tray, only use with the Deepot Cells. Deepots Used for a wide range of hardwood and other tree seedlings, an excellent choice for plant material requiring a deeper root ball. Also provides the flexibility to spread seedlings out or consolidate them for sorting and maximizing dense growing space. Cells are made from recycled polypropylene, 2.5" dia at top, 10" deep, and are slightly tapered with 8 interior vertical ribs to prevent spiraling. 14.8" x 12" tray holds 20 cells.