Grodan Delta 4 Block 3 in x 3 in x 2.5 in w/ Hole (48/Cs) Its unique formula also allows

Its unique formula also allows for outstanding control of powdery mildew found in the garden

Outstanding results controlling powdery mildew

Your biological go-to insecticide

Measures 20 in x 18 in x 2 in

Grodan Delta 4 Block 3 in x 3 in x 2.5 in w/ Hole (48/Cs) Its unique formula also allowsGro Blocks are similar to a plant container. Need a 3 in pot? Then choose a 3 in Gro Block. Small plants can be fully grown in our larger Gro Blocks. Holes are perfect size for any 1. 5 in starter plug. Come in packs labeled with instructions. Big Mama is Grodan's largest block ever produced! Big enough to grow a large plant for its entire life. More than twice the amount of wool as our Hugo Block.