For home and market gardeners. Round cells. Use with Seedling Trays for extra support or with Leakproof Trays for bottom-watering. Holes spaced for canopy development. 24-cell flats are recommended for cucumber, eggplant, melons, pumpkin, squash, tomatoes, and large-seeded herbs and flowers. Compatibility: Use with all Johnny's trays except Shallow Leakproof Trays (white) and Shallow Germination Trays (black).