The Sta Green Large Plant Food Spike Trees Shrubs Nutrition 12 Spikes Box is a slow-release fertilizer made in the United States. It comes in a convenient stick form, ready for use, with ingredients including ammonia, phosphate, and nitrogen. Specifically designed for outdoor use, this product is compatible with shrubs and trees, providing up to 6 months of nutrition for healthy plant growth. The 3lb box contains 12 spikes, offering a hassle-free way to nourish your plants efficiently.