The fertilizer formulation in Vigoro Tree and Shrub Fertilizer Spikes contains too much nitrogen for your fruit trees and berry bushes. I'd suggest using Vigoro Fruit, Nut & Citrus Fertilizer Spikes. These spikes have a lower nitrogen content but a higher level of phosphorous, which is what encourages flowering and fruit production. Excessive amounts of nitrogen will result in lots of leafy green growth, at the expense of flowering and fruiting. Hope this clarifies things for you.
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