Grodan Delta 4 - 3 in Block 3 in x 3 in x 2.5 in No Hole (48/Cs) It is adjustable from 20%–80%

It is adjustable from 20%–80% RH humidity with positive On and Off settings

Gro-Slabs provide the final stage for growing a spectacularly large plant

Sealant yields 16

Made from a base of the best organic dairy cow manure in the country

Overall height is 25 in

Grodan Delta 4 - 3 in Block 3 in x 3 in x 2.5 in No Hole (48/Cs) It is adjustable from 20%–80%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.