My town trims trees and shrubs on town property in the spring, just before
the leaves come in.
If you live in an area where trees are in-leaf year-round, then I'd guess
that trimming anytime would be OK. What do you see your town employees
When the weather is nice, they usually block off a traffic lane or two, dig a hole with a backhoe and then a half dozen stand around the edge of the hole and stare down in it.
When bad weather strikes, I suspect they hang out at the maintenance garage and play poker.
It depends upon the shrub and your local climate. But the general rule
of thumb for flowering shrubs is: spring flowering shrubs should be
pruned right after they're done blooming, summer flowering shrubs get
pruned in late winter/early spring.
That's right....lilacs and rhododendrons, for instance, should be
pruned, if needed, right after flowering finishes because they bloom on
the previous years growth. Rho's form their buds the previous year.
There are thousands of good websites, from BHG to county extension
services that give good info about caring for landscape plants.
This year has been a little crazy....my young pear tree didn't bloom
this year because it bore heavily last year. Pears do that. My lilac,
planted last year and bloomed last year but not this year....same
reason? Mock cherry didn't bloom; mature tree that bloomed heavily last
year but no blossoms this year; I hate the thing because it drops junk
in my koi pond. Will probably have it removed, but it is the only shade
in my back yard :o(
It depends what you want e.g. more blossoms/fruit or
improved structure. In most US states the Ag. Extension
dept. of the state government provides what is in effect
free information about gardening and arboriculture. These
have special knowledge of local plants and local weather
that is hard to find conveniently in public libraries.
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