Trees growing in their natural habitat (the forest) should have access to all of the minerals they need to survive and grow.  Anything you can do in suburbia to mimic that habitat can reduce the need for fertilizer.  This may include letting leaves remain on the ground in the fall instead of raking them up.  Chances are, though, that despite your best efforts, the need for fertilizer will not be entirely eliminated; especially as your trees get older.

 

The main reason to fertilize trees and shrubs is to bolster their health so they are better prepared to fight off pests, disease, and environmental stresses.  While fertilizer can't solve all of a tree's problems, it will go a long way to give it a fighting chance.

 

Fertilizers are made up of macronutrients (Nitrogen, Phosphorus, and Potassium) and micronutrients (such as Iron, Magnesium and Manganese).  These minerals all have different effects on the growth of a tree and different trees need different formulations.  It is important to ensure that you use the right fertilizer for your tree.

 

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