Grower's Edge Block Covers 4 in (40/Pack)
For blocks of rockwool and other grow media. Grower's Edge® Block Covers block light from media—which helps reduce algae. Use white side up to reflect light. Use toothpick to hold cover in place. Hole in center of cover measures 1/2 inch in diameter.
We Also Recommend
Roots Organics Original Potting Soil 1.5 Cu Ft (70/Plt)