Ready to use liquid plant food drippers, specially formulated to help you easily feed your indoor plants. Yates Thrive Indoor Plants & Ferns Liquid Plant Food Drippers provides a gentle feed for healthy leaves and flowers. Each dripper contains the right NPK balance to feed your indoor plants and ferns for 4 weeks. To use the dripper, simply snip off the tip of the dripper and insert into the potting mix of your pot plant.