idk about ya'll but i think that OMRI certified does not mean that you dont use "non organic" but naturally occurring minerals.. all of the letters in a fert are minerals. and no way can a living being create a mineral. they digest it and die.. therefor if you fed a cow perlite and he shat it out it would be "organic"... nope i dont think so. my mother is an organic botanist and she has taught in more than one local collage. she told me i wasnt cheating using soil additives as long as i wasnt mixing straight chemicals into my soil... if it dont kill the bacteria in the soil its not bad... and btw i think but cant confirm yet but perlite has living organisms in it i believe.. and or develops them in the porous holes and therefor is much better then vermiculite for organic growing..
-J"Stoned
mainegrown Reviewed by mainegrown on . Worm Castings last how long.....??? Worm Castings Last how long ?? .....in your soil mixture, soilless build, standing along with perlite and vermiculite or used in a tea..... Just how long will worm castings last....meaning feed the much needed and used "N". What I use in a soil build of Foxfarm Ocean Forest Soil mix, Botanicare Ready Grow (moisture formula), Worm castings, Blood and Bone meals, Mexican and Jamaican Bat Guanos, Greensand plus, Sea Kelp (Ascophyllum Nodosum), Dolomite Lime, perlite and Rating: 5