When Is the Best Time to Trim Trees and Bushes?
                     When Should You Cut Back Trees and Shrubs?
Trees and shrubs need to be pruned for so many reasons. Overgrown branches,
improving the shape, removing dead branches are the most common reasons to cut
back trees and shrubs. When considering pruning, timing plays an important role in
determining whether the results are good or harmful. Many people have heard this
the best time to cut back trees in your landscape design Sacramento’s home is
winter and late spring. 
But, that’s not the case with all trees and shrubs. Most trees are benefited from
winter or late spring pruning, while some shrubs and trees can experience harm or
serious damage. 
The best time to prune a tree or shrub can be determined after you know what type
of shrub or tree it is. 
Here are the best tips to understand what time is best for your shrubs and 
trees to cut them back:
Proper timing for Shrubs 
 Spring-flowering shrubs
These shrubs such as lilac, forsythia, jasmine, rosemary, honeysuckle, and quince
should be pruned once they have flowered. Usually, late spring is considered the
best time to prune spring-flowering shrubs.  Cutting them back before they have
bloomed  can  risk  removing  the  flower  buds.   The  best  time  for  them  is  after
flowering. In case, the shrub has overgrown and needs to be reduced, rejuvenating
pruning can be done in later winter or early spring. Make sure you don’t do heavy
pruning as it can be detrimental for these shrubs.
 Hedges 
Late winter,  mid-to-late summer,  or  early  spring are the best  times to cut  back
hedges. 
Proper timing for Trees
Dead and damaged branches or limbs 
If a tree has dead or damaged branches, the best time to cut them is in winter as
they are dormant during this time.  
Pruning in the dormant season is beneficial because trees heal faster, trees are at
lesser risk of pest invasion or sap flowing. 
No matter  what  time of  year it  is,  a  dead and diseased limb needs removal  or
pruning. It is done to prevent tree disease and  tree removal Sacramento. It is
also required to stimulate growth from the area which is not dead or diseased. 
Some trees may need removal instead of trimming and pruning for safety reasons.
It’s best to contact an arborist to find out if you need tree removal or tree trimming
and the tree  removal  cost will  be  decided  after  evaluation  of  your  tree  by  the
arborist. 
Evergreen Trees
Pine, fir, spruce is the evergreen trees that are best pruned in later winter. Although
trees such as spruce and fir can be cut back to side limb and sideways bud in early
spring. 
Spring blooming trees
Just like spring-blooming shrubs, don’t prune trees that will bloom in spring. Wait
until they have bloomed or have flowered.  Some of the spring-blooming trees are
cherry, dogwood, redbud, and pear.
Summer blooming trees
You can prune summer-blooming trees in the dormant season(late winter).  
Trees that can be pruned any time 
 If you have a tree with weakened branches in your yard, 
it needs tree trimming Sacramento before any strong storm or hurricane 
comes. Weak branches need to be removed to prevent anyone from getting 
injured if the branches fall due to a hurricane or storm. 
 You can trim and prune small tree limbs any time of the year. 
 Rejuvenation pruning can be done for hedges at any time. 
-------- Source --------
https://www.zonedesire.com/when-should-you-cut-back-trees-and-shrubs/