Grodan Delta 6.5 - 4 in Block 4 in x 4 in x 2.5 in w/ Hole (36/Cs) Specifically designed features allow this

Specifically designed features allow this tray to sit flat on shelving with a trough that hangs slightly over the edge

Ideal for air movement from an air pump to air stones

Like all Quest products it can be placed at ground level for immediate operation or hung overhead and out of the way

Designed for water-sensitive crops

Grodan Delta 6.5 - 4 in Block 4 in x 4 in x 2.5 in w/ Hole (36/Cs) Specifically designed features allow thisGro 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.