Jobe’s Evergreen Tree Fertilizer Spikes, 9-Pk are slow-release fertilizer spikes designed for outdoor use with trees. Made by Jobe’s, a trusted brand, these spikes are ready for use and come in a convenient pack. The recommended season of interest is summer, fall, and spring, making them ideal for promoting healthy growth and vibrant blooms in your garden. Each spike is compact, measuring 9.130 inches in length, 2.750 inches in height, and 6.500 inches in width, making it easy to apply and effective for nourishing your trees.