Pruning & Crown Reduction · Cambridge
Tree Pruning and Crown Reduction in Cambridge
In Cambridge, pruning has an extra argument in its favour: it keeps a tree you would otherwise need a City permit, an arborist report and replacement trees to remove.
Cambridge's private tree by-law treats maintenance pruning, when a qualified tree professional determines it, as exempt from the permit requirement. That makes pruning the obvious first option for a big tree that worries you. A mature silver maple over a Preston roof or a willow leaning out over the Speed can often be made safe for another decade by removing the dead wood, shortening the limbs that have run out too far, and reducing the overall weight of the crown, at a fraction of the cost of removal and with none of the paperwork.
Reduction versus topping
Crown reduction cuts a branch back to a suitable side branch that can take over as the new tip. The cuts are modest, they close over, and the tree keeps its natural form at a lower height and spread. Topping cuts the top out of a tree at an arbitrary height, leaving stubs that never close, rot from the cut, and sprout a thicket of weakly attached shoots. Cambridge has plenty of topped silver maples from decades past and they are the most dangerous trees in the city today. Topping is also arguably injury under the by-law, since it is not maintenance pruning by any professional standard. We do not do it.
The pruning work that comes up most
- Deadwooding mature maples, willows and oaks before the dead limbs come down on their own.
- Roof and structure clearance on the narrow lots of Hespeler and old Preston, where a tree planted a metre from the house in 1920 is now on the roof.
- Service wire clearance. The wire from the pole to the house is on your property and keeping it clear is the owner's job; GrandBridge Energy at 1-877-871-2215 handles the primary lines and is involved where a limb is on or near them.
- Weight reduction on long horizontal limbs over roofs, decks and pools, shortening the lever arm on a questionable union.
- Crown thinning and raising for light, wind and clearance over drives and walks.
- Riverbank trees. On valley lots, reduction is frequently the right answer precisely because removal would disturb the bank; a willow reduced by a third is still holding the slope.
Timing
Most pruning can be done year-round. Maples bleed sap when cut in late winter, which is harmless but messy. Ontario advises against pruning or wounding oaks between April and November because of oak wilt, confirmed in the province in 2023, and Cambridge's oaks along the Grand are worth protecting, so oak work is scheduled for the dormant season. Boulevard trees are pruned by the City's forestry crews, requested through Service Cambridge, not by you or by us.
A pruning quote from us lists the limbs and the cuts and gives the reason for each, so the plan is on paper before the climber leaves the ground.
Frequently asked questions
Do I need a permit to prune a tree in Cambridge?
Not for maintenance pruning determined by a qualified tree professional; the by-law exempts it. Heavy cutting that damages the tree, including topping, is not maintenance pruning and could count as injury to a protected tree. Proper reduction and deadwooding sit comfortably inside the exemption.
How much can come off a mature tree at once?
As a rule no more than about a quarter of the live crown in a season, and less on an old or stressed tree. If a tree needs more than that to be safe, removal is the honest recommendation and the permit conversation starts.
The neighbour's tree overhangs my yard. Can you cut back my side?
Generally overhanging branches can be pruned back to the boundary, but in Cambridge there is a catch: pruning that injures a tree of 20 cm or more is a by-law matter as well as a neighbourly one. The cleaner answer is a conversation with the owner and one proper pruning of the whole tree.
Serving Cambridge and surrounding areas. Contact us for a no-obligation quote specific to your property.