Plants in your home and garden that don't like coffee grounds as fertilizer are those that are sensitive to acidity or caffeine
In the vegetable garden, asparagus is the most sensitive to acidic soil and prefers a fairly neutral pH level of 6.5 to 7.0.
Fresh coffee grounds can also have a negative effect on several common flowers and trees. Lilacs and roses like pH levels between 6 and 7, linden trees like pH between 7 and 7.5
Other plants that won't appreciate your coffee grounds are those that are sensitive to caffeine, including roses, lilies, and hydrangeas
The final concern with using coffee grounds as an organic fertilizer for your garden soil is that it will cause fungal growth.
It's important to use only a thin layer as mulch or fertilizer regardless of the plant, but as long as you use coffee grounds in moderation
They'll actually help prevent the growth of some harmful fungus types.
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