I always use a high N formula, on bark, coconut husk chips, even
sphagnum.....with no loss of blooms (although I sometimes switch to a
high P bloom formula as bloom season approaches). I use Dynagro, Jerry's
Grow for a few plants (catt's and phrags). Since N is used at a faster
rate by plants, there is really no need for a balanced formula...you are
just getting excess P and K wasting away or building up as the N gets
used up. Although I do sometimes use bloom boosters, I believe that the
same effect can be achieved by reducing or stopping the fertilizing
entirely, as I do for some paphs in the winter. Take care, Eric Muehlbauer