As the Michigan ground begins to thaw and the first hints of green emerge, it’s time to dust off your garden gloves and grab those shears. While winter is the season for major structural changes, spring offers a timely window for clean-up pruning that sets the stage for a lush, vibrant growing season. Consider this your official invitation to get outside, enjoy the fresh Michigan air, and give your landscape the refresh it needs to truly flourish and bloom.
Here’s our guide for navigating the nuances of spring pruning in Michigan.
WHY PRUNE? THE BENEFITS BEYOND THE CUT
Pruning is more than just a garden chore; it’s essential maintenance that promotes the long-term health and vitality of your plants.
- Disease Prevention: Removing dead, damaged, or diseased wood eliminates potential entry points for pathogens and prevents the spread of infection to healthy growth.
- Structural Integrity: Lightly pruning helps shape the plant and removes crossing branches that might rub together and create wounds.
- Vigorous Growth: By removing old wood, you encourage the plant to redirect its energy toward producing fresh, healthy new growth and more abundant blooms.
- Airflow and Light: Thinning out a dense canopy improves air circulation and allows more sunlight to reach the center of the plant, which is vital for reducing fungal issues.
THE EARLY SPRING CLEAN-UP (MARCH – EARLY APRIL)
Once the ground thaws and plants begin to “wake up,” focus on maintaining health and encouraging fresh growth.
- The “Three D’s” Remain Priority: Late March is the perfect time to identify wood that didn’t survive the winter. Always remove anything Dead, Damaged, or Diseased as soon as it is spotted.
- Summer-Blooming Shrubs: Between late March and early April, prune plants that bloom on “new wood” (growth produced in the current year). This includes varieties like Butterfly Bush, Panicle Hydrangeas (such as ‘Limelight’ or ‘Quick Fire’), and Smooth Hydrangeas (like ‘Incrediball’ or ‘Annabelle’).
- Ornamental Grasses: If you didn’t cut these back in the fall, now is the time to do so in early April. Trimming grasses down to about 6 inches above the ground before new shoots emerge ensures a clean look and encourages new growth.
- Fruit Trees: Finish pruning apple and pear trees by early April. Focus on removing dead or crossing branches to maintain an open center for air circulation.
TREATMENT OF PERENNIALS: THE SPRING REVIVAL (APRIL)
By April, many hardy perennials should be cut back to the ground to clear away last year’s debris and provide better airflow. For most herbaceous varieties, this means cutting them back to within 1 to 3 inches of the soil line.
Common Michigan perennials to prune in April include:
- Catmint (Nepeta): Shear back old growth to make room for dense, colorful mounds.
- Coneflower (Echinacea): Cut back old stalks to prepare for a strong start.
- Daylilies (Hemerocallis): Remove the previous year’s dead foliage to allow fresh green blades to emerge cleanly.
- Hostas: Clear away dead foliage in early April before the new “eyes” poke through the soil.
- Asters and Sedum: Clear the woody remains of these late-season bloomers to the ground now.
- Coral Bells (Heuchera): Trim away any winter-tattered or “heaved” leaves to refresh the mound.
ROSE REFRESH: PRUNING BY VARIETY (LATE APRIL – MAY)
Roses generally need to be pruned later than other perennials, typically when leaf buds begin to swell in late April or early May.
- Knock Out® & Shrub Roses: Prune them back by about one-third to one-half their height in late April to maintain a tidy shape and encourage heavy blooms.
- Groundcover Roses (like Oso Easy®): These require very little pruning; simply remove the “Three D’s” in early May.
- Hybrid Tea & Grandiflora Roses: Once the danger of hard frost has passed in May, prune canes back to healthy, green wood (typically 12–18 inches from the ground) leaving strong canes in a “vase” shape to maximize airflow.
PRECISION PRUNING: HOW TO MAKE THE CUT
Knowing how to prune is just as important as knowing what to prune to ensure quick healing.
For Trees
- The Branch Collar Rule: When removing a tree limb, always cut just outside the branch collar – the swollen area where the branch meets the trunk. Cutting too close (a flush cut) or leaving a long stub prevents proper “callusing” and can lead to rot.
- Avoid the “Big Snip”: Never remove more than 25% of a tree’s living canopy in a single season. Heavy pruning can stress the tree and trigger a flush of weak, spindly growth.
For Perennials & Shrubs
- Angle Your Snips: Make cuts at a slight 45-degree angle. This allows water to run off the wound rather than pooling on top of the cut, reducing the risk of rot and fungal disease.
- The “Node” Rule: Always cut back to just above a node – the point where a leaf or bud joins the stem. This directs the plant’s energy into that specific bud, preventing “die-back” stubs that attract pests.
- Shearing vs. Thinning: For mounding plants like Catmint or Spirea, “shearing” the entire top layer is acceptable for shape. For larger shrubs, “thinning” (removing entire stems at the base) is better for improving light penetration.
THE WAITING GAME: THE “WAIT LIST” (LATE SPRING – EARLY SUMMER)
Jumping the gun on certain species can accidentally “prune away” your spring color.
- Spring-Blooming Favorites: Do not prune Lilacs, Forsythia, Azaleas, or Serviceberries in the early spring. These plants set their flower buds last summer, and pruning them in March or April removes this year’s blossoms. Wait until May or June, immediately after they finish flowering, to do any shaping.
- Oak and Maple Alerts: To protect against Oak Wilt, avoid pruning Oaks and Maples from April through July when fungal spores and beetles are most active.
- Evergreens: While you can remove dead tips, avoid heavy structural pruning in early spring. It is best to wait until June or July once the new growth has emerged to avoid exposing the plant to winter damage.
Whether you’re looking for the right tools to start your spring clean-up or searching for the perfect reblooming hydrangea to add to your landscape, Everett’s experts can help you make the right cut. Visit Everett’s Gardens this month to get your questions answered and your garden ready for its most beautiful spring yet.