Summarize the following:
Look up the type of plant that you have and see if it correctly digests acidic products. Many herbs and indoor plants will be suitable for this liquid coffee treatment. These are some examples that you can spray a coffee mixture on:  Spider plants Roses Hydrangeas African Violets. As well as using up the liquid, there are ways to also get rid of the grounds that are beneficial for suitable plants. For example, you can combine coffee grounds with soil, compost or fertilizer. These products can then be given to plants such as the following, to boost their growth:  Lettuce Gardenias Azaleas Hibiscus.

Summary:
Research to see whether your plant is acid-friendly. Use coffee grounds on other plants.