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Structural Pruning
By: Steve NimzConsulting Arborist
(c) Copyright Steve Nimz
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When is the best time to begin structural pruning?
• A young tree is 100% dynamic mass, this is the best time to begin structural pruning.
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• Before you Jump in, lets stand back and Think about what we are about to do.
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Pruning will always be a controversial subject, there are many variables:
• How much to prune• When to prune• How often to prune• How to prune for
structure, fruit, privacy, shade, sun, clearance, etc.
• When to prune to kill a tree
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The answer is simple. Learn how trees are constructed, how they function and how they defend themselves. Know their natural growth patterns and rates for foliage and roots, tolerance to pruning, best growth environment etc.
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(c) Copyright Steve Nimz
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Pruning brings together Science, Art and Common Sense.
• Science gives us the proper knowledge about how trees are constructed and proper pruning technology (tree biology)
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• Artistic skill brings the desired results
• It takes more than a chainsaw to properly structurally prune a tree. Similar to the other artists, each piece is different. We’re not flipping hamburgers.
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• Common sense is the judgment call in doing pruning, remembering the results (document), and repeating what is correct and is best for the tree.
• The responsibility of a professional Arborist is to give trees as much high quality care and time as possible.
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There will be no Recipes today, Recipes make Robots
(we are not baking a cake)
Use Guidelines and Terminology to direct you in making the right decision.
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Pruning young trees is similar yet different in several ways compared to what we as Arborist deal with daily on mature trees.
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Understanding different pruning procedures for ex current and de current trees
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Tree Structure for branch bark ridge and collar
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(c) Copyright Steve Nimz
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Prune at branch collar
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(c) Copyright Steve Nimz
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Proper branch removal guidelines
# 1
# 2
# 3
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Included bark
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Bark inclusion
Decay anddiscolorationfrom selfwounding
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Co-dominant Stems
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Pruning Techniques
• Crown cleaning• Crown thinning• Crown raising• Crown reduction• Heading
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• Crown cleaning: removal of dead, diseased, weakly attached branches from the tree’s crown
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• Crown thinning: includes crown cleaning plus selective removal of branches to reduce weight and to increase light penetration and air movement. Develop an even distribution of branches throughout the crown. Be careful not to lion tail branches.
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• Crown raising: includes crown cleaning plus removal of lower branches to provide clearance for buildings, signs, vehicles, pedestrians and vistas.
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Lion Tailing
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• Crown reduction: includes crown cleaning plus the reduction in the size of the tree by pruning back the outer crown to laterals (drop crotch method).
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Improper
Proper
Correct removal of small leader on young tree
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• Heading or Topping back: cutting limbs back to stubsWarning: negative repercussions may occur from this type of pruning (decline, death or poor branch connections)
Other pruning methods should be explored prior to using heading cuts
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Poor branch attachment usually occurs on heading cuts
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Trees have Dignity
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When topping is done without knowledge and common sense
It is a crime to nature
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•Basal Pruning: when trees have grown out of proportion to their location and cannot properly be maintained and/or become a hazard, removal and replacement is the best alternative
Basal pruning
Replacement planting
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• Subordinate pruning: remove or prune back competing (codominant) stems to promote one dominant leader.
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Reduce growth rate of low aggressive branches
PushPush
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Young tree trunk development
Temporarybranches
Dominant leader
Temporary branches for increased trunk taper development
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• Utility pruning: remove branches or stems to prevent loss of utility services.
Shigo90-3-90
90- 90% of the time3- 3 cuts90- Remove 90% of the branch conflict
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Phenology
1. Onset of growth2. Formation of new leaves and needles3. High photosynthetic period4. Formation of new bark and wood, and storage of energy5. Dormancy
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Timing, Dose, Limits
January
Phenology
Timing (when and where)Dose (how much)Limits (plant and system limits)
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• Pruning tools:
– Hand pruners and loppers (bypass type)– Hand saws– Pole saw and clip– Power saws– Safety gear: helmet, safety glasses, ear
plugs, etc.
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Steps to reduce pruning requirements
Proper tree selection is the Best Wayto minimize pruning, this includes:
– Right tree species for the locationand end desired results (5 to 50 years)
– Selecting the tree from a nursery, growing high quality material
– Proper planting procedures
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This does not occur often enough
Landscape Architect Nursery Planting hole
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Steps to follow1. Know your tree species, growth patterns of foliage
and roots.
2. Understand the final goal and objective, what is the tree expected to fulfill for the owners and/or project
3. Determine if the tree species, location and final results make sense and are economically do-able
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4. Step back and take a look at the tree from different angles. What function does the tree provide?
5. Will pruning maintain and enhance those functions?
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6. Determine the defects which should be removed no matter what the goals.
a) Included bark branchesb) Rubbing branchesc) Insect and diseased branchesd) Deadwoode) Broken branchesf) Fast growing side branches overtaking
leaderg) Multiple leaders/Co-dominant stems
(determined by tree structure)
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7. Determine what pruning is necessary to accomplish the goal for the trees’ structure in 5 to 20 years:a) Young tree structural pruningb) Crown cleaning c) Crown thinningd) Crown raisinge) Crown reductionf) Heading cuts (re-structuring)g) Sub-ordinate pruningh) Utility pruning
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8. Proper branch removala) Branch collarsb) Branch bark ridgec) Included barkd) No visible collare) Stem bark ridge
9. When to prune?a) Transplantingb) Floweringc) Fruitingd) Clearance
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Let’s Go Touch Trees
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