When to feed my Phalaenopsis?

I grow indoor, so Phals grow all year. I fertilize every irrigation at 30ppmN. For the first one (Orchid Focus Grow), 1.64ml of the fertilizer (I'm assuming that it is liquid) in 1l of water gives about 30ppmN.

 

I agree with Naoki. In the rainforests where many orchids originate, they are fed every time it rains, which can be daily, if not several times a day. Feeding your plants at a very low concentration of water-soluble fertilizer at every watering is the best way to mimic that.

If you divide 2.3 by the %N on the fertilizer label, the result is the ml to add to a liter for 25 ppm N, so rounding up or down for convenience is no issue.

By the way, despite the marketing hype, there really is no such thing as a "growth" or ""bloom" formula. Feed the plants a small amount of mineral nutrition regularly, and give the plant the growing conditions it needs, and it'll grow and bloom to its maximum, genetically-programmed capability.

 

I have using gh cal.mag magic for three month for every day with very low dose. ro ppm is 20 base with gh cal/mag magic after mix is 60 ppm and here is the result
before use WP 20180314 002
after three month continue use gh cal/mag magic WP 20180614 003