My garden has rocks and weed fabric.
Must I remove both and add the grounds to the soil or can I just add on them on top of the rocks?
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They must be added directly on top of the soil - just throwing them onto rocks won't have any impact other than to make a nasty looking mess. Given the minor effect they have on soil acidification, in your situation, I'd find it far too inconvenient to dispose of them in this manner.