CSLB C-27 Landscaping ContractorPlanting and LandscapingHard
A landscape maintenance crew is tasked with severe reduction pruning of an overgrown, mature 'Little Gem' Magnolia (Magnolia grandiflora 'Little Gem') that is encroaching on a building. The client wants to reduce its size significantly without harming the tree's health. What is the best approach for this task?
- AGradually reduce the canopy over 2-3 years, focusing on removing the largest encroaching branches back to a suitable lateral.
- BShear the entire plant with hedge trimmers to create a smaller, more compact form.
- CRemove up to 50% of the canopy by cutting large branches back to the trunk or a main scaffold branch.
- DPerform a hard topping cut at a uniform height to reduce overall size quickly.
Show answer & explanationAnswer & explanation
Correct answer: A. Gradually reduce the canopy over 2-3 years, focusing on removing the largest encroaching branches back to a suitable lateral.
Severe reduction pruning on a mature tree like Magnolia 'Little Gem' should be done gradually over several years to minimize stress and prevent excessive water sprout development or tree decline. Removing large branches back to appropriate laterals rather than topping or shearing helps maintain the tree's natural form and health.
Why the other options are wrong
- B. Shearing is inappropriate for a tree like Magnolia and destroys its natural form, leading to unhealthy growth and potential decline.
- C. Removing 50% of the canopy, especially large branches, in a single pruning event is too aggressive for most mature trees and can cause severe stress or decline.
- D. Topping is highly detrimental to tree health, leading to weak, vigorous regrowth and decay, and should be avoided.
Tree Reduction Pruning
The systematic removal of branches to decrease the overall size of a tree, often performed on mature specimens, requiring careful technique to maintain health and structural integrity.
- Should be done gradually (over multiple years) for mature trees.
- Cuts should be made back to a strong lateral branch or the main trunk.
- Avoid topping, which is detrimental to tree health.
Memory trick: Gradual Growth, Gentle Cuts, Good Health.