People often ask if coffee grounds can be used as plant fertilizer. The answer is, yes, they can be very beneficial to houseplants.
One thing to keep in mind when using coffee grounds as fertilizer is that they can cause excessive moisture retention, fungal overgrowth, and even impair plant growth if not used correctly.
For this reason, it is important to use them sparingly and mix them with other soil amendments such as compost or peat moss before applying them to your plants.
Soil amendments, such as compost or peat moss, should always be used when adding coffee grounds to soil.
Coffee grounds can cause excessive moisture retention and fungal overgrowth if not mixed with other soil amendments.

Most houseplants will benefit from having coffee grounds added to their soil.
Most houseplants will benefit from having coffee grounds added to their soil because coffee grounds are a very useful source of nutrients that houseplants can use effectively.
A word of caution, though: don’t use too much or you might end up with a soggy, brown mess on your hands.
Are coffee grounds good for house plants?
Yes, they can be very beneficial to houseplants when used correctly. They contain nitrogen, potassium, and magnesium- all essential nutrients for plants.
They also contain small amounts of calcium and copper, which are beneficial to plants as well.
How much coffee ground should be used?
To apply them more directly, you could also scatter some around the base of each plant in its container after repotting it.
Just be sure not to add too many or you may burn your plant’s roots. You should only add four tablespoons per gallon of regular potting soil at most and should alternate with other organic matter to avoid any imbalances.