It's no secret that beautiful, healthy trees make your yard look spectacular. Jobe's fertilizer spikes for trees and shrubs ensure a continuous supply of nutrients below the surface, where the trees active roots are growing. Jobe's spikes are easy to insert around each tree's dripline and the slow-release formula lasts all season. No wasteful runoff, no mess, hazards or smells - only a safe beautiful yard. For best results, use Jobe's fertilizer spikes for trees and shrubs in early spring and late fall.