Indoor plants count on you to keep them fertilized, and Jobes Plant Food Spikes make the job easy. Jobe's Plant Food Spikes provide a continuous supply of nutrients to keep plants looking their best. Spikes are easy to install and work beneath the surface of the soill, gently releasing important nutrients right at plant roots. Unlike liquids or granules, Jobes Plant Food Spikes eliminate mess, hazards, and smells and do not wash through when you water. Chemicals stay safely away from the reach of children and pets, and houseplants, flowering plants, ferns and palms stay healthy and vigorous for up to two months.