The amount of live tissue that should be removed depends on the tree’s size, species, and age, as well as the pruning objectives. Younger trees tolerate the removal of a higher percentage of living tissue better than mature trees do. Generally, no more than 25% of the crown should be removed at once, and less for mature trees. Removing even a single, large-diameter limb can result in significant canopy loss and can create a wound that the tree may not be able to close. Care should be taken to achieve pruning objectives while minimizing live branch loss and wound size.
Trees produce a dense crown of leaves to manufacture the sugar used as energy for growth and development. Removal of foliage through pruning can reduce growth and stored energy reserves. Heavy pruning can be a significant health stress for the tree.
A common mistake is to remove too much inner foliage and small branches. It is important to maintain an even distribution of foliage along large limbs and in the lower portion of the crown. Over-thinning reduces the tree’s sugar production capacity and can create tip-heavy limbs that are prone to failure. Mature trees should require little routine pruning. A widely accepted rule of thumb is never to remove more than one fourth of a tree’s leaf bearing crown. In a mature tree, pruning even that much could have negative effects The older and larger a tree becomes, the less energy it has in reserve to close wounds and defend against decay or insect attack. The pruning of large, mature trees is usually limited to the removal of dead or potentially hazardous limbs. - International Society of Arboriculture (ISA)
As trees become mature, they become intolerant of heavy pruning. Limit pruning to cleaning (removal of dead and damaged branches). Excessive pruning also creates a hormone imbalance between Auxins (produced in the terminal buds of the canopy) which stimulates root growth and Gibberellins (produced in the root tips) which stimulates canopy growth. This puts the root system into a multi-year decline, resulting in a multi-year decline in canopy growth.
On mature trees (greater than 75% mature size for the site), pruning dose should be limited to 5% to 10%, based on actual growth and vigor of the tree. - University of Florida
Include these generic safety statements to reduce the homeowner’s and pruning crew’s liability. “All work shall be performed in accordance with American National Standards Institute A300 Pruning Standards and Z133.3 Safety Standards.” “All work shall be performed under the supervision of a licensed, International Society of Arboriculture certified arborist.”
ANSI A300 -
4.23 Lion’s tailing: The removal of an excess number of inner and lower lateral branches from parent branches. Lion’s tailing is not an acceptable pruning practice.
Trees produce a dense crown of leaves to manufacture the sugar used as energy for growth and development. Removal of foliage through pruning can reduce growth and stored energy reserves. Heavy pruning can be a significant health stress for the tree.
A common mistake is to remove too much inner foliage and small branches. It is important to maintain an even distribution of foliage along large limbs and in the lower portion of the crown. Over-thinning reduces the tree’s sugar production capacity and can create tip-heavy limbs that are prone to failure. Mature trees should require little routine pruning. A widely accepted rule of thumb is never to remove more than one fourth of a tree’s leaf bearing crown. In a mature tree, pruning even that much could have negative effects The older and larger a tree becomes, the less energy it has in reserve to close wounds and defend against decay or insect attack. The pruning of large, mature trees is usually limited to the removal of dead or potentially hazardous limbs. - International Society of Arboriculture (ISA)
As trees become mature, they become intolerant of heavy pruning. Limit pruning to cleaning (removal of dead and damaged branches). Excessive pruning also creates a hormone imbalance between Auxins (produced in the terminal buds of the canopy) which stimulates root growth and Gibberellins (produced in the root tips) which stimulates canopy growth. This puts the root system into a multi-year decline, resulting in a multi-year decline in canopy growth.
On mature trees (greater than 75% mature size for the site), pruning dose should be limited to 5% to 10%, based on actual growth and vigor of the tree. - University of Florida
To maintain trunk taper resilient to winds, at least one-half of the foliage should be in the lower two-thirds of the tree. The lowest limb should originate in the bottom one-third of the tree’s height.
- Pruning should maintain the tree’s natural shape.
Include these generic safety statements to reduce the homeowner’s and pruning crew’s liability. “All work shall be performed in accordance with American National Standards Institute A300 Pruning Standards and Z133.3 Safety Standards.” “All work shall be performed under the supervision of a licensed, International Society of Arboriculture certified arborist.”
ANSI A300 -
4.23 Lion’s tailing: The removal of an excess number of inner and lower lateral branches from parent branches. Lion’s tailing is not an acceptable pruning practice.
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