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Coco , Sand and Perilite...
That's my "Medium"
from there I put Peat, EWC,Bone Meal, Organic Compost and a pinch of Dolomite Lime
to help balanced PH...
From THIS montage of mix I add "Teas"
I use Alaska brand Fish Fertilizers...
Different ones for Veg 5-1-1 or Bloom 0-10-10
They have a...