Grodan Improved Gro-Block Jumbo 6" x 6" x 4" Case of 64 micro-nutrients so you don't have to

so you don't have to worry about rusting

These are laboratory grade

and heating the incoming cold outside air in wintertime

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Grodan Improved Gro-Block Jumbo 6" x 6" x 4" Case of 64 micro-nutrients so you don't have toDescription Product Details: Grodan Improved Jumbo (White Foil) 6" x 6" x 4" (Case of 64) Grodan Improved Jumbo (White Foil) 6" x 6" x 4" (Case of 64): Grodan Improved Grodan partnered with the Wageningen University and Research facility in The Netherlands and top growers throughout North America to identify the optimal stone wool substrate and irrigation strategies for specialty crops. The result of months of scientific research and trials is Grodan