Pruning & Crown Thinning in Duncan

Crown thinning, crown raising and reduction

Crown thinning removes selected branches to let wind pass through the canopy instead of catching it, which lowers the chance of the tree failing in a storm. Crown raising removes lower limbs for clearance over a driveway, fence or roofline, and crown reduction shortens an oversized canopy without the stubbed look of topping — which Duncan Tree Removal does not do.

Why pruning can avoid a Bylaw No. 3135 removal permit

A protected tree under Duncan's Tree Protection Bylaw No. 3135 — 20 centimetres DBH for Douglas fir, western red cedar, grand fir and big leaf maple, 30 centimetres for other species — can often stay standing and simply be pruned back from a structure or line instead of removed, avoiding the permit process entirely. An ISA Certified Arborist assesses whether pruning solves the problem before removal is even discussed.

Nesting season timing

The BC Wildlife Act and the federal Migratory Bird Convention Act make it illegal to disturb an active bird nest, and the regional nesting window runs from late March through mid-August. Duncan Tree Removal checks a tree for active nests before pruning during that window and can schedule non-urgent work outside it.

What's included

• Crown thinning

  Selective branch removal to reduce wind resistance and storm risk.

• Crown raising

  Lower-limb removal for clearance over a driveway, fence or roofline.

• Crown reduction

  Shortens an oversized canopy without stub-cutting or topping.

The pruning process

1. 1

   Arborist assessment — an ISA Certified Arborist inspects the tree's structure and plans the cuts against the ANSI A300 standard.

2. 2

   Nesting check — the canopy is checked for active nests before any work between late March and mid-August.

3. 3

   Written quote — a flat-rate price for the scope of pruning, confirmed before the crew arrives.

4. 4

   Pruning and cleanup — cuts are made to standard, and all cut material is chipped or hauled from the site.

Local conditions

Douglas fir and western red cedar make up most of the mature canopy on Cowichan Valley properties, and both are named specifically at the lower 20-centimetre DBH threshold in Duncan's Tree Protection Bylaw No. 3135 — one more reason pruning is checked as an alternative before a removal permit is filed. Garry oak and arbutus, both slower-growing and less common, are pruned conservatively to protect their shape and long-term health.

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