Commercial Plantation Thinning
Source: PEI Ecosystem-Based Forest Management Standards Manual (October 2025), pp. 21–22
What it is
Commercial plantation thinning works in dense softwood plantations. It improves tree quality, growth, species composition and diversity, and extends the life of the stand, favouring the best trees for veneer and sawlogs. High-density plantings on open fields are designed to need this treatment later (see Full Planting).
Eligibility
| Test | Standard |
|---|---|
| Softwood crop species | Red spruce, white spruce, black spruce, Norway spruce, eastern hemlock, white pine, red pine, balsam fir, Japanese larch, eastern larch |
| Hardwood crop species | White birch, yellow birch, sugar maple, red maple, white ash, black ash, red oak |
| Stand vigour | Able to keep growing for at least 20 years |
| Crop trees | At least 500 evenly distributed crop trees per hectare |
What counts as a crop tree. It has a 4 m bole free of: bulges, large burls, cankers, hollow butt log, seams or splits, crook, butt rot, crotch, conks, dead top, excessive sweep (over 5 cm), significant bark or root damage, and 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 40% of basal area |
| Crop trees retained | At least 500 good-quality, evenly distributed crop trees/ha, each at least 12 cm DBH |
| Crop tree condition | Dominant or co-dominant, at least 30% live crown, able to grow for 20 years |
| Wildlife trees | At least 15/ha left and/or created; they may be girdled for diversity and future coarse woody debris, or released to grow and produce seed |
| Legacy trees | Kept and not damaged |
| Damage limit | No more than 5% of crop trees damaged |
What counts as damage. Broken limbs and/or bark damage that exposes more than 10 cm² of sapwood on a tree.
Species mix. Plantation thinnings also carry the general requirement that at least 15% of residual density be alternate species (see Diversity Enhancement).
Based on the PEI Ecosystem-Based Forest Management Standards Manual (October 2025), pp. 21–22. Where this guide and the manual differ, the manual governs.