Hashyanswered grow question 2 years ago I'm in agreement with Mrs larimar on this. I find it strengthens the stems and I use it through flower. The silica product I use needs to be mixed separately from other nutes, so If I'm making 5L solution I'll put 1L in seperate container. Put the silica in the 4L water mix well adjust ph, then the other 1L will consist of my other nutes then I put that into the silica bucket, give it a good mix and re check Ph and adjust if needed.