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Hey there! I think what he means is only foliar (branches and leaves) so make sure that you don't get much of that water into the soil. Not sprinkle it but use a spray bottle instead would be my suggestion. I try to use liquid vermicompost for the best results, any foliar product will do for this early stage. I bought a really nice one for orchid development, but it serves for frugal and edible plants as well. And the cheaper product I use is distilled water from the AC, but I guess you don't really use these kind of devices over there, or do you?

Never thought about using the AC water before. We use a tube to dump the water down the gutter drain.