Dogwood Pruning Guide: Timing, Techniques & Tree Health

When and How to Prune Your Flowering Dogwood

Keith's 15-year-old dogwood in Kentucky needs pruning, but timing and technique are critical for this borer-susceptible species.

Optimal Pruning Window

Late fall to early spring (dormant season) is the only safe period. In Kentucky, this means November through March. Absolutely avoid April through October when dogwood borers (Synanthedon scitula) are active—they're attracted to fresh wounds.

Pruning Objectives for Mature Dogwoods

• Remove dead, damaged, or diseased wood
• Eliminate crossing/rubbing branches
• Thin interior for light penetration and air circulation
• Maintain natural tiered branching habit
• Preserve lower limbs to shade shallow roots

Step-by-Step Technique

1. Sanitize tools between cuts (70% alcohol or 10% bleach solution).
2. Start with the "3 D's" (Dead, Damaged, Diseased)—remove entirely to branch collar.
3. Identify structural issues: Narrow crotches, inward-growing branches, water sprouts.
4. Thin selectively: Remove no more than 15-20% of live canopy annually.
5. Preserve the collar: Cut just outside the branch bark ridge—never flush to trunk.
6. Leave lower branches unless they touch ground (invites pests/disease).

Special Considerations

• Borers: If summer pruning is unavoidable (storm damage), immediately treat cuts with permethrin-based borer spray.
• Anthracnose: Disinfect tools between trees; remove and destroy infected material.
• Root zone: Avoid soil compaction near trunk—dogwoods have shallow, wide-spreading roots.
• Natural form: Dogwoods look best with their characteristic horizontal tiering—don't "round over" or top.

Post-Pruning Care

• Water deeply if soil is dry (1 inch per week).
• Apply 2-3 inches organic mulch to drip line (keep 6 inches from trunk).
• Monitor for borer entry holes (sawdust-like frass) May-August.
• Fertilize only if soil test indicates need—dogwoods are sensitive to excess nitrogen.

Patient, minimal pruning preserves the dogwood's graceful architecture while reducing disease pressure. When in doubt, less is more for this iconic understory tree.