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Originally Posted by Simply Bananas
Do you have a link for these stats? Thanks in advance.
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For the homeowner issues of over-watering and over-application of coffee grounds, I am relying on my own experiences and those of other retail nursery professionals here in the San Diego Horticultural Society. Basically, when a novice gardener brings a dead plant in the front door: 'heads' its over watering, 'tails' its overwatering, and if the flipped coin first lands on an edge its too much coffee grounds.
The lab reports of coffee grounds (and numerous other compost inputs) that I have seen were in relation to the manufacture of compost from alternative materials. Scary stuff. This is one reason I get my compost from a facility that participates in outside testing once every six months. I've never seen an online report for coffee grounds with the full elemental details.