Dennis4246, what type of orchids do u have? I have 3 phals and I use 1/4 of the strength. I fertilize mine 2wice a month and on the last week of the month, I flush it with regular water (eg. Weeks 1 & 3 fertilize, week 2 & 4 just water with week 4 flushing). Anybody have thoughts on this method?