Miracle-Gro® makes growing beautiful, vibrant houseplants easy with their Indoor Plant Food Spikes. These spikes contain micronutrients that are especially beneficial to houseplants. And, to add to the hype, they feed your indoor plants for up to 2 months! Using Miracle-Gro® Indoor Plant Food Spikes is as simple as can be. First, make a hole in moist soil with the included Miracle-Aerator® spike halfway between the plant stem and the pot rim, then place one plant food spike in each hole and press it down until covered by soil. You should replace the spikes every 30 days in the spring and summer, and every 60 days in the fall and winter. Make sure to water your plants regularly as required. When used as directed, Miracle-Gro® Indoor Plant Food Spikes are safe to use with all indoor plants, including ficus, snake plant, croton, spider plants, and pothos. Feed and grow stronger houseplants with Miracle-Gro®.