Coffee For Houseplants. Benefits of coffee grounds on house plants. But this is only true for unwashed coffee grounds.
Christmas Cacti Schlumbergera spp By using coffee grounds for cacti and succulents you are able to manage a good drainage system to avoid any stagnant water that would ultimately kill your plant through rotting. Coffee ground is filled with nutritional benefits for your plants so much so that you can water your plants with coffee and they would be perfectly fine. You can use coffee grounds for indoor plants.
So do houseplants like coffee grounds.
If you decide to try watering houseplants with coffee keep a close eye on your plant. Marino says typically only the latter. Coffee grounds contain reasonable levels of nitrogen which will break down and create a compost that is high in essential nutrients. It is better to give just a little and work out what your plants respond to than to overdo it and cause the plant to react poorly.