Keeping your houseplants healthy and fertilized is easier than ever with Jobe's houseplant food spikes. These spikes provide a continuous supply of important nutrients right at the roots, where plants need it most. The pre-measured, specially formulated spikes are simply inserted into the soil around your plant. Unlike liquids or granular, Jobe's houseplant spikes eliminate mess, hazards and smells - and can't wash through when you water.