Grande Dunes Nations Homes Myrtle Beach Fertilizer Tree Spikes for Evergreen Trees & Shrubs, 13 3 4, 15 Pk.. It's no secret that beautiful, healthy trees make your yard look spectacular. Jobe's(TM) Fertilizer Tree Spikes for Evergreen Trees & Shrubs ensure a continuous supply of nutrients below the surface, where the tree's active roots are growing. Jobe's Spikes are easy to insert around the tree's dripline, and the slow release formula lasts all season. No wasteful runoff, no mess, hazards or smells only a safe beautiful yard. Spikes are specially formulated for acid loving Evergreen trees and shrubs. For best results, use Jobe's Fertilizer Spikes for Trees & Shrubs in early spring and late fall.