You can get soluble silica derived from silica dioxide that is intended for use in the hydroponics and can be used by plants including cannabis. Regardless, I've used silica in the past but won't be using it again because it's not needed. The less stuff you dump on your plants the better and unnecessary stuff like silica is just another money grab by marketing/nutrient companies with their fancy bottles and shiny labels.
So correct, and any form of Si used in growing...
Like I said, "Plants get ALL they CAN USE from the soil they are in." Using more is a WASTE of money and you've been sold a bill of goods...
For shits and giggles...Ran it in a soil grown Bruce Banner plant(s)...They have rather weak stem's and break too often from weight (if you don't support them EARLY enough)..
The Si did NOT increase the stem strength or cure any part of that strains (my pheno anyway) weak stem problem.....Just had to try, even though I knew better....
Hell, you want a real laugh....AN use's it in a trich increasing formula, under the grounds that it "irritates" the plant into producing more trichomes... BS.
Big Mike irritates me but, that don't stiffen my trichome...Now his "ex" old lady...Her scent works by it's self...