Plant Growing Tray - 10 1/2" x10 1/12"x 2 1/4" Perfect Microgreens Seed Trays -With Holes - 10 pack New! The perfect sturdy Microgreens growing seed trays in a 10 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. Drain holes in the bottom ensures no over-watering the young plants. This growing tray is great for the Commercial and small growers alike.