Peters 20-20-20 + TE Professional

[Fairorchids]

It takes us 2.1/2 to 3.1/2 hours to water the whole greenhouse (26 x 96), depending upon how dry the plants are.

We then apply fertilizer with a hose end sprayer, which takes 40-45 min (since we have to refill the sprayer with concentrate 12-15 times).

With a smaller collection in your house or hobby size greenhouse, where you only provide a few ounces to each plant, i can see the 50-100 ppm solution in every 'watering' making sense. However, I am always concerned about salt build-up in the pot, so I insist on at least one watering with clean water between each fertilizer application.