Soil and Compost forum: Coffee grounds in seed starting pothing soil?

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Name: Cayuga
Massachusetts (Zone 6a)
Mar 19, 2017 8:12 AM CST
What do you think: can I add used coffee grounds to my indoor seed starting soil? I want to increase the organic content.
Name: Cayuga
Massachusetts (Zone 6a)
Mar 24, 2017 5:07 PM CST
Well Cayuga, I would be a bit leery of doing that, particularly for starting seeds. I have seen mold growing on coffee grounds. I would be afraid of damping off.
Minnesota (Zone 3b)
Jul 4, 2017 11:56 PM CST
Coffee grounds attract organisms in the ground, like worms, that are very beneficial, i.e. outdoor soil critters.
I would not use them in potting soil indoors as what makes them work so well outdoors is missing.

I used to store my coffee grounds all winter in cans and pots.
they were moldy and nasty smelling in spring but I would put them in the hole with potatoes.
I would notice that when I dug up the potatoes, the area where I planted was a very fine soft soil.
I often thought of going to coffee shops and getting their grounds for potato planting but my yield have been good enough I just now just dump them in pile in the garden in winter and roto-till them in in spring but they would make a great addition to a compost heap as I do in summer.

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