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Originally Posted by arleneg  No, it's not. The numbers are the percentages for Nitrogen-Phosphate-Potash in a fertilizer solution. Therefore, 20-14-13 has less phosphate and potash in a fertilizer solution than the 20-20-20 or 10-10-10. |
Thanks Arlene - I'm still trying to sort through this fertilizer stuff. Do you use the same general fertilizers on all your orchids? I only have a small collection of catts., phals. & dens. Richard's post, above, has given some suggestions for using which fertilizer for different types of orchids. I found this helpful.