Commercial Hardwood Thinning
Source: PEI Ecosystem-Based Forest Management Standards Manual (October 2025), pp. 18–19
What it is
Commercial hardwood thinning works in dense, pole-stage (immature) hardwood stands. It improves tree quality, growth, species composition and diversity, and extends the life of the stand. The best trees are favoured for veneer and sawlogs, and they also become a good seed source for natural regeneration. The wood removed is merchantable.
Eligibility
| Test | Standard |
|---|---|
| Hardwood crop species | Sugar maple, red maple on upland sites, yellow birch, red oak, white ash, white birch, largetooth aspen |
| Softwood crop species | White pine, red spruce, white spruce, black spruce, eastern hemlock |
| Stand vigour | Able to keep growing for at least 20 years |
| Crop trees | At least 250 evenly distributed crop trees per hectare |
What counts as a crop tree. It has 2.5 m of clear bole, with at least three sides free of these defects:
- Stem: bulges, large burls, cankers, hollow butt log, seams or splits, crook, butt rot, crotch, conks, excessive sweep (over 5 cm), significant bark or root damage.
- Crown and branches: dead top, branches on more than two faces, large branches, significant branch dieback in the live crown.
Standards and assessment
| Measure | Standard |
|---|---|
| Residual density by species | Must meet the species-specific standards in the Prince Edward Island Forestry Handbook (available from your local PEI Forests, Fish and Wildlife office) |
| Removal cap | No more than 30% of basal area — less for shade-tolerant species (see Shade Tolerance Chart) |
| Release | At least 250 crop trees/ha released on at least 3 sides |
| Crop trees | Dominant or co-dominant, at least 30% live crown, at least 12 cm DBH, good health and form, able to grow for 20 years |
| Wildlife trees | At least 15/ha left and/or created |
| Legacy trees | Kept and not damaged |
| Damage limit | No more than 5% of crop trees damaged |
Two ways to use wildlife trees. Girdle them to add stand diversity and, eventually, coarse woody debris. Or release them so they grow and produce seed.
What counts as damage. Broken limbs and/or bark damage that exposes more than 10 cm² of sapwood on a tree.
Commercial thinnings compared
| Hardwood | Softwood | Plantation | |
|---|---|---|---|
| Minimum crop trees | 250/ha | 500/ha | 500/ha |
| Crop tree bole | 2.5 m clear, 3 sides | 4 m, defect-free | 4 m, defect-free |
| Maximum basal area removed | 30% (less if shade-tolerant) | 40% | 40% |
| Minimum crop tree DBH | 12 cm | 12 cm | 12 cm |
| Wildlife trees | ≥ 15/ha | ≥ 15/ha | ≥ 15/ha |
Based on the PEI Ecosystem-Based Forest Management Standards Manual (October 2025), pp. 18–19. Where this guide and the manual differ, the manual governs.