Grower's EdgeBlock Covers, Blocks Light from Growing Media, Reduces Algae and Pest Problems, Use with Rockwool and Other Growing Media, Each Pack Contains 40 Covers, Covers are 6-inches

Description

Grower's Edge Block Covers block light from reaching the growing media. This helps to reduce algae and pest problems in Rockwool and other growing media. Easily set up the covers by placing the white side up and using a small object, like a toothpick, to hold the cover in place. Each package of Grower's Edge Block Covers contains 40 covers.