When it comes to fertilizing every one makes their own choices. I'll tell you what choice I made and why.
I fertilize with every watering very weakly.
In situ the plants roots get exposed to al kind of organic debris that touches the roots, for instant decaying leaf litter, dead insects and bird poop. When it rains little bits flush along the roots.
From this I concluded that orchids have a constant supply of food but in very small concentrations. I try to copy that by fertilizing with every watering in a very low doses.
I don't increase the amount of fertilizer when the plants enter their main grow season. Because they need more water during this part of the year, they get more fertilizer as it's in the water always.
Just my 2 $ cents about this subject.
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