Grodan Stonewool Delta Gro-Blocks & Big Mama Options:Grodan Delta 4 Block 3 in x 3 in x 2.5 in w/ Hole (48/Cs) Four-way output control: 60%

Four-way output control: 60%

With over 20 years of medical and horticultural enzyme formulation and production experience

The humidifier is capable of between 11

and soilless applications

Grodan Stonewool Delta Gro-Blocks & Big Mama Options:Grodan Delta 4 Block 3 in x 3 in x 2.5 in w/ Hole (48/Cs) Four-way output control: 60%Gro 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.