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 Though there are several non-native species that
do well in our fertile Illinois soils, we encourage the use of
native species to promote disease resistance, suitability to native
soils, and mitigating the spread of invasive species (even
unknowingly).
Factors to take into consideration when choosing a tree species
• light requirements
• moisture requirements
• soil pH
• soil drainage
Using the right plant for the right site will factor into the
overall health and longevity of a tree or shrub. It can take many
years for symptoms of stress to appear, and by then it may be too
late (or too large!) to move the tree to a more suitable site.
Determining necessity and time for fertilization
Though fertilization can help maintain tree vitality, I would first
recommend establishing a need and purpose for it. If a soil test is
not performed every 3-5 years, then nutrient concentrations may not
be known. If we don’t know it’s needed, why waste product and time
applying it? In most landscapes, healthy trees and shrubs do not
require fertilizers, especially once they reach their mature size or
if they are native species. [to top of second
column] |
It is not recommended to fertilize a tree at planting time, as
the tree’s energy is directed toward root growth and establishment and nitrogen
applications can hinder root growth. If the lawn is already regularly
fertilized, there is likely no reason to fertilize trees separately.
Additionally, trees and shrubs should not be fertilized during drought
conditions. Excessive fertilization can cause permanent damage to trees as well
as affect water quality.
If you have completed a soil test, established a need for fertilizer due to a
nutrient deficiency or pH issue, and have ensured adequate moisture to tree
roots, you can find more information on tree fertilization methods in this great
publication from University of Missouri Extension
https://extension.missouri.edu/
publications/g6865.
The best time to fertilize trees, when necessary, is early spring or late fall
after leaf drop.
[SOURCE/WRITER: Sarah Vogel,
Horticulture and Natural Resource Educator]
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