Colorado Master Gardener Training Pruning Mature Shade Trees
Prune mature trees with a purpose in mind. <ul><li>Crown cleaning </li></ul><ul><li>Crown thinning </li></ul><ul><li>Crown...
Prune mature trees with a purpose in mind. <ul><li>Crown Cleaning </li></ul>
 
Prune mature trees with a purpose in mind. <ul><li>Crown Cleaning </li></ul><ul><ul><li>Removed dead, diseased, and broken...
Why dead branches should be removed: <ul><ul><li>Hazard issues  </li></ul></ul><ul><ul><li>Source of disease organisms or ...
When removing dead branches, do NOT cut into callus tissue.
Prune mature trees with a purpose in mind . <ul><li>Crown Thinning </li></ul>
Prune mature trees with a purpose in mind . <ul><li>Crown Thinning </li></ul><ul><ul><li>Use  natural target pruning cuts ...
Prune mature trees with a purpose in mind . <ul><li>Crown Thinning </li></ul><ul><ul><li>Use  natural target pruning cuts ...
Prune mature trees with a purpose in mind. <ul><li>Crown Raising </li></ul>
Prune mature trees with a purpose in mind. <ul><li>Crown Raising </li></ul><ul><li>Use  natural target pruning cuts ,  pru...
Prune large trees with a purpose in mind. <ul><li>Crown Reduction </li></ul>
Prune large trees with a purpose in mind. <ul><li>Crown Reduction </li></ul><ul><li>Requires  reduction cuts </li></ul><ul...
Prune large trees with a purpose in mind. <ul><li>Crown Reduction </li></ul><ul><li>Begin pruning as tree starts to reach ...
Don’t top trees. Topped trees become structurally unsound for life! Branch tissue when it grows with trunk/parent branch B...
 
 
Epicormic shoot
Topping > Auxin removal
Topping >> the “Don King” look?
Prune large trees with a purpose in mind. <ul><li>Hazard Reduction </li></ul>
Prune large trees with a purpose in mind. <ul><li>Hazard Reduction </li></ul><ul><li>Crown cleaning </li></ul><ul><li>Crow...
Pruning storm damaged trees
Pruning storm damaged trees <ul><li>Keep when scaffold branches and trunk have sound wood or can be pruned to sound wood. ...
Pruning storm damaged trees <ul><li>Keep in mind </li></ul><ul><ul><li>Natural target pruning </li></ul></ul><ul><ul><li>S...
Pruning old trees with declining vigor
Pruning old trees with declining vigor <ul><li>Focus on </li></ul><ul><ul><li>Weak and failing branches </li></ul></ul><ul...
Pruning root damaged trees
Pruning root damaged trees <ul><li>Prune dead and weak branches </li></ul><ul><ul><li>Carbohydrate reserves in wood help m...
Utility rights-of-way take priority over a tree’s appearance and health.
Utility rights-of-way take priority over a tree’s appearance and health. <ul><li>$1 billion / year </li></ul><ul><li>Gener...
 
Aspen
Crabapple
 
 
How should you prune a mature tree?
A tree’s structural integrity is set for life by the training it receives while young.
U-prune with  laser pointer
How did you do?
 
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8a Pruning Mature Shade Trees

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8a Pruning Mature Shade Trees

  1. 1. Colorado Master Gardener Training Pruning Mature Shade Trees
  2. 2. Prune mature trees with a purpose in mind. <ul><li>Crown cleaning </li></ul><ul><li>Crown thinning </li></ul><ul><li>Crown raising </li></ul><ul><li>Crown reduction </li></ul><ul><li>Hazard reduction </li></ul><ul><li>Vista clearance </li></ul>A good pruning job will not be highly noticeable!
  3. 3. Prune mature trees with a purpose in mind. <ul><li>Crown Cleaning </li></ul>
  4. 5. Prune mature trees with a purpose in mind. <ul><li>Crown Cleaning </li></ul><ul><ul><li>Removed dead, diseased, and broken branches </li></ul></ul>
  5. 6. Why dead branches should be removed: <ul><ul><li>Hazard issues </li></ul></ul><ul><ul><li>Source of disease organisms or insects </li></ul></ul><ul><ul><ul><li>Fireblight </li></ul></ul></ul><ul><ul><ul><li>Cytospora </li></ul></ul></ul><ul><ul><ul><li>Borers </li></ul></ul></ul>
  6. 7. When removing dead branches, do NOT cut into callus tissue.
  7. 8. Prune mature trees with a purpose in mind . <ul><li>Crown Thinning </li></ul>
  8. 9. Prune mature trees with a purpose in mind . <ul><li>Crown Thinning </li></ul><ul><ul><li>Use natural target pruning cuts (thinning cuts) </li></ul></ul><ul><ul><li>Focus on branches <2” diameter </li></ul></ul>
  9. 10. Prune mature trees with a purpose in mind . <ul><li>Crown Thinning </li></ul><ul><ul><li>Use natural target pruning cuts (thinning cuts) </li></ul></ul><ul><ul><li>Focus on branches <2” diameter </li></ul></ul>A good pruning job will not be highly noticeable!
  10. 11. Prune mature trees with a purpose in mind. <ul><li>Crown Raising </li></ul>
  11. 12. Prune mature trees with a purpose in mind. <ul><li>Crown Raising </li></ul><ul><li>Use natural target pruning cuts , pruning to more upright LARGER laterals or remove branch entirely. </li></ul><ul><li>Avoid reduction cuts to smaller laterals. </li></ul><ul><li>1/2 foliage in bottom 2/3s of tree </li></ul>
  12. 13. Prune large trees with a purpose in mind. <ul><li>Crown Reduction </li></ul>
  13. 14. Prune large trees with a purpose in mind. <ul><li>Crown Reduction </li></ul><ul><li>Requires reduction cuts </li></ul><ul><ul><li>Doesn’t protect the branch defense zone </li></ul></ul><ul><ul><li>Predisposes branch/trunk to internal decay </li></ul></ul><ul><li>Avoid crown reduction on trees in stress or decline </li></ul>
  14. 15. Prune large trees with a purpose in mind. <ul><li>Crown Reduction </li></ul><ul><li>Begin pruning as tree starts to reach acceptable size, rather than when overgrown. </li></ul><ul><li>Remove <1/4 of crown-foliage/year </li></ul>
  15. 16. Don’t top trees. Topped trees become structurally unsound for life! Branch tissue when it grows with trunk/parent branch Branch tissue from epicormic growth
  16. 19. Epicormic shoot
  17. 20. Topping > Auxin removal
  18. 21. Topping >> the “Don King” look?
  19. 22. Prune large trees with a purpose in mind. <ul><li>Hazard Reduction </li></ul>
  20. 23. Prune large trees with a purpose in mind. <ul><li>Hazard Reduction </li></ul><ul><li>Crown cleaning </li></ul><ul><li>Crown thinning </li></ul><ul><ul><li>Reduce weight on hazardous limbs </li></ul></ul>
  21. 24. Pruning storm damaged trees
  22. 25. Pruning storm damaged trees <ul><li>Keep when scaffold branches and trunk have sound wood or can be pruned to sound wood. </li></ul><ul><li>May accept less than ideal pruning by “mother nature” </li></ul>
  23. 26. Pruning storm damaged trees <ul><li>Keep in mind </li></ul><ul><ul><li>Natural target pruning </li></ul></ul><ul><ul><li>Structural integrity </li></ul></ul><ul><li>Heavy pruning required? </li></ul><ul><ul><li>Select less vigorous shoots </li></ul></ul><ul><ul><li>May require work over 2-4 years </li></ul></ul><ul><ul><ul><li>< 1/4 of foliage removed per year </li></ul></ul></ul>
  24. 27. Pruning old trees with declining vigor
  25. 28. Pruning old trees with declining vigor <ul><li>Focus on </li></ul><ul><ul><li>Weak and failing branches </li></ul></ul><ul><ul><li>Lowering crown over time </li></ul></ul><ul><ul><li>Do NOT “top” </li></ul></ul>
  26. 29. Pruning root damaged trees
  27. 30. Pruning root damaged trees <ul><li>Prune dead and weak branches </li></ul><ul><ul><li>Carbohydrate reserves in wood help maintain tree’s vigor </li></ul></ul><ul><ul><li>Allow natural selection of weak branches </li></ul></ul>Does the tree need crown cleaning or crown thinning?
  28. 31. Utility rights-of-way take priority over a tree’s appearance and health.
  29. 32. Utility rights-of-way take priority over a tree’s appearance and health. <ul><li>$1 billion / year </li></ul><ul><li>General arborist </li></ul><ul><ul><li>10 feet from 50,000 volt line </li></ul></ul><ul><li>Line clearance training </li></ul><ul><ul><li>15 feet from 552,000 volt line </li></ul></ul><ul><ul><li>2 feet from 15,000 volt line </li></ul></ul>
  30. 34. Aspen
  31. 35. Crabapple
  32. 38. How should you prune a mature tree?
  33. 39. A tree’s structural integrity is set for life by the training it receives while young.
  34. 40. U-prune with laser pointer
  35. 41. How did you do?

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