Growers Edge® Block Covers 6in (40/Pack) Soil Meters Research shows that this powerful

Research shows that this powerful formula will encourage plant and root development

This high drainage mix is known for its consistent performance

quality or yield

Low Frequency Square Wave Ballast

Your plants will additionally experience improved heat and cold tolerance

Growers Edge® Block Covers 6in (40/Pack) Soil Meters Research shows that this powerfulGrower'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.