TREE CARE SERVICES INCLUDING CROWN WORK & MORE
A crown lift is the lifting of the "crown beginning", i.e. the lowest point of the tree crown. This can be achieved by removal of the lowest boughs, or by removal of low-hanging side-branches. This is usually done for reasons of practicality, since the lowest branches of a tree help to develop good trunk taper, through dynamics created by the wind acting on the tree which stimulates woody growth. The lowest branches, as well as playing an important mechanical role, also have a very important biological role, as sugars produced in the leaves are transported to the roots for storage via an active (thus an energy-requiring) transport system, and a crown lift will result in a greater distance over-which the tree must transport sugars to the roots. The arborist seeks to optimise tree health, so a crown lift should be done only for purposes of practical necessity as it is not for mechanical or biological benefit to a tree.
Crown reduction is the reduction of the crown of the tree in order to reduce the height and spread of the tree while maintaining the natural growth habit and its natural look. The tree crown should be reduced by no more than 25% in any pruning session, 25% being a percentage not of tree height but of leaf-bearing material, so as not to force the tree into a panic response which will stress the tree, and result in more rapid regrowth in many species. This can be performed on trees growing to a great size in a small space as an alternative to tree removal.
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Crown cleaning is the removal from the crown of anything which ought not to be there. This includes deadwood, rubbing branches (which can damage the tree's bark, thus opening the tree up to infection, and which can also result in mechanical stress leading to cracks which are a hazard and which also act as another doorway for infection), weakly attached branches, poorly spaced branches, inward growing branches and diseased branches. Cleaning the crown of the tree optimises tree health, as much as can be achieved through pruning methods, and leaves the tree with a good structure, safer, and being more aesthetically pleasing. This is what to have performed if you are interested in maintaining healthy, strong and safe trees.
A crown thin is the selective removal of branches from the crown of a tree. This leaves the silhouette almost unchanged, but allows more light and air penetration through the crown. More air penetration has been linked to a reduce in risk for certain tree diseases, and it also reduces the "wind sail effect", the force generated against the tree roots by the wind acting on the tree crown, thus making the tree less prone to being blown-over in a strong wind or storm. Over-thinning, as excess in pruning in general, is not to the tree's benefit, as it can result in unwanted rapid regrowth, which is often tangly and crowded, and it stresses the tree. If the tree is left for a time with insufficient leaves to produce enough sugar to meet its own requirements, it is forced to draw on stored energy reserves, thus leaving the tree depleted, and the tree in a fatigued state, more prone to disease and with less energy for all its other energy-requiring processes.