The Miracle-Gro 400157 Indoor Plant Food Fertilizer is a slow-release fertilizer in solid spike form, with each spike weighing 2.2 ounces. Suitable for indoor use on a variety of plants including flowers and potted plants, this fertilizer contains phosphate and nitrogen to promote plant growth. The fertilizer spikes are ready for use and come in a box packaging, making them convenient for use throughout the year in both indoor and outdoor settings. Made in the United States, this mineral-based fertilizer is designed to provide essential nutrients to keep plants healthy and thriving.