Are coffee grounds good for plants?
Coffee grounds sprinkled on or mixed into the soil in a pot usually don’t help: they form a crust, keep the surface damp and can go mouldy. Added to the compost with your other scraps, they do.
Updated 11 October 2026. How we write these pages
Where coffee grounds go, and where they don’t
On top of the soil
No
A layer of grounds forms a crust that holds water at the surface and can go mouldy.
Mixed into the soil
Better not
In a pot they break down slowly, and in growing trials, plants with used grounds in their soil grew less.
In the compost
Yes
They break down along with the other scraps, and finished compost is good for vegetable beds and for pots.
Where the idea comes from
Coffee grounds contain nitrogen, one of the nutrients in fertilisers. In used grounds, though, it’s bound up in material that breaks down slowly, and a plant in a pot can’t get at it when it needs it.
In a compost heap the grounds break down over time with everything else, and the finished compost feeds the soil.
What to use instead of coffee grounds
Plants in pots, indoors
A houseplant fertiliser.
At the dose on the label, while the plant is growing.
Vegetable patch and garden
Compost with the grounds in it.
Once it’s finished, mixed into the soil or spread over the top.
Questions about coffee grounds
Are coffee grounds good for succulents?
No. Succulents want soil that dries out quickly, and a layer of grounds keeps it damp.
Are coffee grounds good for a lemon tree in a pot?
The same applies. A citrus fertiliser does the job better, at the dose on the label.
Do coffee grounds attract fungus gnats?
They can. Fungus gnats look for damp soil at the surface, and a layer of grounds keeps it damp.
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