Description from The Scotts Company
Conveniently delivers continuous-release feeding that lasts all season for lush, spectacular trees and shrubs.
Apply when ground is soft and moist. Place enclosed plastic cap on top of spike, and drive spike into ground around dripline of ornamental (follow dripline illustration on package). Spikes should be at least 3 feet (90 centimeters) apart.
For small trees and shrubs, spikes should not be place closer than 2 feet (60 centimeters) from trunk or center of tree/shrub.
If dripline is closer than 2 feet (60 centimeters ), insert spikes 2 feet (60 centimeters ) away from center of tree/shrub.
Remove plastic cap, and save for future use. Continue to drive spike until 2 inches (5 centimeters) below soil surface.