Grower's Edge Block Covers are the perfect way to block light from rockwool and other grow media. These covers are specially designed to help reduce algae growth in your garden, while also reflecting light back up onto your plants for optimal growth. To use these covers, simply place them on top of blocks or pots with the white side up, and use a toothpick to hold the cover in place. The covers have a hole in the center measuring 1/2 inch in diameter.
| Size | 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38 |
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