Hello Denise,

In general, here’s a clear, Michigan‑specific pruning guide

Here are some additional resources at the links below:

Tips on tree and shrub pruning - MSU Extension

Pruning.pdf

General Pruning Techniques | NC State Extension Publications

Best Time to Prune Trees in Michigan

Michigan’s climate (cold winters, freeze–thaw cycles, late springs) makes timing especially important.

Deciduous Shade & Ornamental Trees

Late winter to early spring (Feb–early April)

Ideal because trees are dormant, disease pressure is low, and cuts heal quickly once growth resumes.

Examples: maple, oak, honey locust, linden, crabapple, serviceberry.

Fruit Trees (MSU Extension standard)
Apples & Pears: Late winter–early spring before bud break.
Stone Fruits (Peach, Cherry, Plum): Early spring only — avoid fall/winter because open wounds invite Leucostoma canker.
Summer pruning: Light thinning only; reduces vigor and helps manage size.

Evergreens
Pines: Only during the candle stage (late May–early June).
Spruce & Fir: Late winter or mid‑summer.
Arborvitae & Yews: Late spring through mid‑summer.

Best Time to Prune Shrubs in Michigan

Spring‑Flowering Shrubs

Prune right after flowering (May–June).

Examples: lilac, forsythia, weigela, viburnum (early bloomers).

Summer‑Flowering Shrubs

Prune in late winter–early spring because they bloom on new wood.

Examples: panicle hydrangea, rose of Sharon, potentilla, spirea.

Broadleaf Evergreens

Holly, boxwood: Late spring.

Rhododendron: Immediately after flowering.

MSU‑Style Pruning Principles

These align with the general horticultural definitions (pruning = selective removal of branches, buds, or roots).

Remove dead, diseased, crossing, or rubbing branches first.

Never “top” trees — use reduction cuts instead.

Keep the branch collar intact; it’s essential for proper wound closure.

Avoid pruning during leaf‑out or leaf‑drop stress periods.

Sterilize tools when working on diseased plants.

Michigan Timing Summary (Quick Reference)
Plant Type - Best Time - Avoid

Shade Trees - Feb–April - Mid‑summer heat, fall

Apples/Pears - Late winter - Fall

Peaches/Cherries - Early spring - Fall/winter (canker risk)

Pines - Candle stage (May–June) - Any other time

Spring‑Blooming Shrubs - After bloom - Late winter

Summer‑Blooming Shrubs - Late winter - After midsummer

Arborvitae/Yew - Late spring–summer - Late fall

I hope this helps!