Get the best of both worlds with Miracle-Gro Tree & Shrub Plant Food Spikes 15-5-10. Easy feeding of your trees and shrubs, plus plentiful foliage and vibrant colour. These spikes are pre-measured, so theyre ready to use and easy to store. Each fertilizer spike contains essential nutrients and organic ingredients to nourish plants above the soil, and below the ground deep into the root zone. To help your deciduous and flowering trees grow strong all season long, use Miracle-Gro Tree & Shrub Fertilizer Spikes 15-5-10 in the Spring and again in the Fall.