How to Fertilize a Tree
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.
Does My Tree Need Fertilizer?
Trees growing in their natural habitat should have access
to all of the minerals they need to survive and grow. Anything you
can do 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.
When Should I Fertilize My Tree?
A good time to fertilize trees in most Northern temperate
climates is from fall to mid-spring. At these times the tree's roots
take the nutrients from the soil and apply them to important
health-promoting functions such as root development and disease
resistance, rather than simply putting out new growth.
During the growing season, fertilizing can help a tree
overcome mineral deficiencies and fight off infections. If you are
fertilizing in mid- to late summer, avoid formulations high in nitrogen as
this will just promote weak, new growth that may be easily damaged in the
winter.
Where Do I Put The Fertilizer?
The objective of fertilization is to put the nutrients where they will
best be taken up by the tree's roots. Therefore, it is necessary to
fertilize throughout the entire root system. In general, the roots
extend well beyond the outer reach of a tree's branches.
The fertilizer must also be placed underneath the roots of
any competing plants such as grass or other ground cover. Spreading
granular fertilizer on the lawn might make your grass greener, but it will
likely not help your tree.
What Type of Fertilizer Do I Need?
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.
To find out how to obtain the correct fertilizer for your trees or shrubs,
click here.
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