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Reinvigorating a substrate

The "big hack" works for me as well. But in between I've injected PMDD
directly into the substrate using a 3" hypodermic needle and a large
syringe. The needle came from a nurse who works in a cathlab, the syringe
from the local pharmacy. There is always a burst of growth following this
treatment. This gets back to the assumption that laterite "holds" nutrients
in the substrate.