I have this brown powdery stuff one my 3 gal smart pot. I'm experimenting with organics and mixed up some ffof,coco, and some chicken pellets. After the first water with this mix I noticed the brown powdery spots on top of the soil on all my pots " the other pots are 7gal". This went away after I watered again but now my 3gal pot looks like this. Salt build up? Coco not washed? I'm stumped.
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