Reply To: What to do with ground with pretty much zero organic matter?

[zenpmd]

as a finger in the air, how much total do you think I’d need to add to get good amounts into 8 inches of depth?

I used green manure elsewhere and I wonder whether this is one good use for green manure, ie an initial burst of matter

Out of interest – is the same true of horticultural grit? Can you consistently top dress in, say, a Mediterranean herb border, to improve drainage all the way down to the depths of the roots?