Coffee grounds for plants: compost them, don't overdo them
Used grounds are a useful garden ingredient — not a miracle fertiliser.
Spent coffee grounds contain organic matter and some nitrogen, so it's tempting to tip them straight onto plants. Horticultural advice generally favours a gentler route.
Best use: add them to compost
Mix grounds into a compost bin or pit along with dry "browns" such as dry leaves, shredded paper or cardboard. Composting breaks them down and balances them with other materials.
Why not pile them on soil?
A thick layer of wet grounds can clump, form a crust that sheds water, and grow mould. Fresh grounds may also slow some seedlings. If you add them directly, use a thin layer and rake it into the soil.
Simple rules
- Use small amounts — grounds should be a part of your compost, not most of it.
- Dry them out first if storing them.
- Keep them away from seed trays and young seedlings.
- Don't rely on them to keep pests away; that claim isn't well supported.
Paper filters too
Unbleached paper filters can usually go into compost with the grounds. Tear them up so they break down faster.
Want hands-on green-living ideas? Ask about our workshops in Pune.