In Michigan and the rest of the Midwest, trees are fed in early spring before the leaves emerge, or in fall after leaf drop, from about mid October through November, according to Iowa State University Extension. Fertilizer high in nitrogen is avoided in mid to late summer, when Illinois Extension warns it pushes growth that may not harden off before winter.

Why are spring and fall the Midwest feeding windows?

Because roots are active then while shoots are not pushing tender new growth that cold can damage. The cue is the tree's stage, before leaf out or after leaf drop, rather than a fixed date.

Does every Midwest tree need fertilizer?

No. Michigan State University Extension says most landscape trees grow acceptably without it, so feeding follows a soil test or signs such as sparse, yellow green leaves and short twig growth. Trees beside a fertilized lawn often already receive enough nitrogen.

What does a spring feeding look like in the Midwest?

A slow release fertilizer spread under the crown out to the dripline, the circle beneath the outer branches. Michigan State University Extension recommends 1 to 2 pounds of nitrogen per 1,000 square feet, at least half of it in slow release form. TreeHelp Premium Fertilizer, spread around a maple or oak in early spring, feeds slowly through the growing season with a blend matched to the species.

Is a fall feeding worth adding in the Midwest?

Yes, for healthy trees. Where a maple or other shade tree is in good health, TreeHelp Fall Fertilizer is worked into the root zone in mid to late fall, its polymer coated particles holding nitrogen back until spring while its potassium goes to the roots.

Frequently Asked Questions

How is a nutrient shortage confirmed in Michigan?

With a soil test, such as one through the MSU Soil and Plant Nutrient Laboratory, which also sets how much phosphorus and potassium to apply.

Does fertilizer need to go into drilled holes?

No. Michigan State University Extension finds granular fertilizer spread on the surface about as effective as fertilizer placed in drilled holes.

Does sandy soil in parts of Michigan change the plan?

It favors slow release forms. Sandy soil drains fast, so nutrients released gradually are less likely to wash past the roots.

Can fertilizer go down on frozen ground?

No. Roots cannot take up nutrients from frozen soil, and fertilizer on frozen ground can wash away with snowmelt.