“I would mature my vegetables in flats using a cell depth of about two inches,” Tan claims. “But I might mature indigenous prairie plants in the mobile by using a depth of about 6 inches to permit more room for the roots to expand.” Drainage holes at The underside from https://troyfryho.uzblog.net/the-2-minute-rule-for-circular-hole-plant-seedling-tray-45410699