Keeping your houseplants healthy and fertilized is easier than ever with Jobe's(TM) Houseplant Food Spikes. Spikes provide a continuous supply of important nutrients right at the roots, where plants need it most. The premeasured, 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.