Why Does Crown Weight Matter So Much Here?
A tree on shallow soil is held by a wide flat root plate rather than deep anchoring roots. The crown acts as a lever against that plate every time the wind blows.
Reducing the crown shortens the lever. On ground like this, tree trimming and pruning does more for stability than anything else available, and the effect lasts for several years.
How Much Of A Crown Can Be Removed?
A single visit normally takes ten to twenty percent of the living crown. That much comes back without effort and keeps the tree in good shape for years.
Go well beyond it and the tree has to draw on stored reserves. What grows back is fast, soft and badly attached, which leaves the tree in worse condition than before. Your quote states the figure we intend to remove.
Why Are Oak Trees Only Trimmed In Winter?
The disease is a fungus, and it is fatal to oaks. It travels from tree to tree on beetles, and those beetles are attracted to any fresh cut made while the tree is growing.
In the dormant months there are no beetles flying, so the same cut carries no risk. Oak work is therefore booked for winter. Ask in spring and you will be offered a winter date, with the reason explained.
Why Do Cuts Take Longer To Heal On Wet Ground?
Where a branch joins the trunk there is a raised ring of tissue. Cutting just clear of it leaves the tree able to grow over the wound and shut it.
Roots sitting in wet clay have less oxygen available, which means the tree has less energy for sealing wounds. Tree trimming and pruning here is therefore kept light, with correct cuts and modest volumes.
Why Do Street Trees Grow Unevenly?
Light is what shapes a roadside tree. The branches reach out over the open street and stay sparse on the side the building shades, so the weight gradually collects above the traffic.
That is why the tree trimming and pruning we do on these trees is uneven on purpose. Weight comes off the road side, and the shaded side is left to develop.
Should Young Trees Be Pruned?
Yes. Nothing else in tree care returns as much for as little. Fifteen years and three short appointments will fix the framework of a tree permanently.
What happens on those visits is simple: settle on one leading stem, cut out its rivals, take away anything rubbing, and lift the lower branches a stage at a time. Leave it until the tree is mature and the same faults need hardware or felling.