Wheatgrass Growing Tray - 10 1/2" X 10 1/12" X 2 1/4" Plant Seed Trays - No Holes - 25 Pack New! The perfect sturdy Wheatgrass growing seed trays in a 25 pack. 10 1/2" by 10 1//2" and 2 1/4" deep black trays take up less room and will fit on most shelves. Easy to transport from the greenhouse or growing area to the kitchen or restaurant. Use as a drip tray for other tray inserts or pots. This growing tray is great for the Commercial and small growers alike.