You are doing it wrong. Here’s what fertilizer to use on what houseplants

Why: High in nitrogen, good for foliage growth—but holds moisture.
How to Use: Mix 1 tablespoon of used grounds into 1 cup of compost or potting mix every 4–6 weeks. You can also brew a weak “coffee tea” by soaking 1–2 tablespoons of grounds in 1 quart of water overnight, then strain and water your plants with it once a month.
Best Used On: Pothos, Spider Plant, Philodendron, Boston Fern.
Avoid On: Succulents, cacti, ZZ Plant, Snake Plant—prone to rot in damp soil.