"Used grounds are slightly acidic and dense. Sprinkled thickly, they can form a crust that repels water and suffocates roots. Instead, mix small amounts into compost (no more than 10%), or add to an outdoor compost heap where worms can break them down properly. Never dump fresh, wet grounds straight on to houseplants. The test I mixed a few tablespoons of dried coffee grounds into the soil"
"of a spider plant. I didn't observe any crazy growth spurts or any signs of damage, but when I tried watering the pot directly, the soil compacted and water pooled on the surface. Clearly not ideal. The verdict Coffee grounds are great for compost but risky for pots. Used sparingly and well mixed they add nutrients, but on their own they can smother roots. Think of them as a soil additive, not a fertiliser."
Coffee grounds contain nitrogen and organic matter, suggesting fertiliser potential and pest-deterrent effects. Used grounds add nutrients and improve soil texture when incorporated properly. They are slightly acidic and dense; sprinkled thickly they can form a water-repellent crust that suffocates roots. The recommended practice is to mix small amounts into compost (no more than 10%) or add to an outdoor compost heap where worms break them down. Fresh, wet grounds should never be dumped straight onto houseplants. A tester mixed dried grounds into a spider plant pot and observed soil compaction and surface water pooling. Grounds work as compostable soil additives, not standalone fertilisers.
Read at www.theguardian.com
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