Using coffee grounds without heating for indoor plant fertilizer has produced flies.
How long do I bake and what temp is good to sterilize them?
By Lee
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They have been boiled, are as close to sterile as anything. Mix well with soil, add minerals.
I don't have any problem with flies where I collect my coffee grounds (I keep them in a basket on my counter so they will dry out). It may be that your plants are too moist and you may need to make sure the grounds are well mixed into the soil.
I've found that a mixture of 2 Tbsp. pure soap (castile is good) and a pint of water in a spray bottle work wonders for plant pests. Just spray on your plants. The pests don't like the soap. You could also add some pest deterring essential oil such as citronella or basil. Just be sure that you like the scent before you spray it on your plant :)
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