20 Row Seedling Flat &ndash; 5 pack This 20 Row Seedling Flat is great for seed sowing. Drain holes so no over watering when using this 20 Row Seedling Flat. 5 each trays made of very durable plastic and reusable. 10 inch x 7/8 inch x 1 1/4 inch deep rows for easy seeding. Overall dimensions 21 inches x 11 inches x 1 1/4 inches. Row allow you to separate different varieties of seed planting.