4 Shelves With 33cm Spacing The greenhouse contains four mesh shelves with 33cm of space between them and clips to securely attach to the frame. If you’re growing plants, simply remove a shelf to create more growing space. The mesh design of the shelves allows pots to easily drain to prevent waterlogging. Double Zipped Door With Ties The cover features a roll-up double zipped door which can be tightly secured using two ties at the top. This provides easy access when tending to your plants and flowers. Simply leave the door tied up on hot, sunny days to enable air to circulate and encourage pollination.