DON'T: Ornamental trees should never, ever be topped.
And shrubs should rarely be sheared (except real topiary and formal
hedges). Stripping all of the side branches off of a mature pine
or any other tree or shrub, is also a no-no. Stripping is not to
be confused with selective thinning, which can also make shrubs
and trees look open and Oriental.
DO: Prune to enhance a plant's natural beauty; to
make it feel less oppressive, tidier, cleaner; to reduce size somewhat,
depending on the of plant. Selective pruning will reduce the bulk
of the plant and taking off a few lower limbs of a tree is okay.
How: The two types of pruning cuts are thinning
and heading. A heading cut is basically cutting off the tip or end
of a branch, twig, or stem. Heading creates bushiness. The next
spring growth is stimulated at the tips of cut branches. Shearing,
topping and pinching hedges: and chrysanthemums. Not too good for
most shrubs and trees.
A thinning cut removes the branch back to another
branch or twig, or to the ground. Most pruning consists of thinning
cuts. It forces new growth in existing branches and spreads new
growth more evenly throughout the plant. Thinning cuts will let
light into the interior, allowing for green branches to cut to if
you choose to reduce the size of your shrub. It stays "done"
longer and looks natural.
PRUNING BY HABIT
Prune to enhance the plant's natural shape or "habit".
Plants have one of three basic habits.
I. CANE GROWERS
Plants that renew themselves by sending up new branches called canes
from the base. Forsythias, roses, bamboo, kerria, weigela --- very
tough plants --- you can hardly hurt them.
Stare at your shrub.
Take out all dead wood. Always do this first.
Take out some (1/3 to 1/8) of the biggest and oldest, as well as
a few of the puniest canes, to the base. Do this every year
to keep the size controlled.
Pick out a few of the worst canes that rub or cross each other,
that look sick or go the wrong way (that is, start at the outside,
head back through the center and out the other side), and ugly
branches (usually too straight).
Generally prune to open up the center.
Tidy up the top with thinning cuts. Cut back anything hanging
on the ground and cut to a side branch or bud.
Prune with vigor!
Look like mounds and are medium-tough plants, found in mass
plantings. They have small leaves and supple branches.
You usually just want to tidy them up or reduce their size.
People like to shear these -- don't you! Examples of mounds
are abelias, escallonia, barberries and Mexican orange. These
are easiest to make and deep small.
Locate the longest, most unruly branch. Grab the tip with your
left hand. Follow the branch down into the interior of the plant
with your right-hand pruners, and snip it off two inches to one foot below
the general surface level of your shrub. Cut to a side branch or bud,
These shrubs often benefit from taking out some of the old canes to their
base. This opens up and renews the shrub. Any dead wood or weeds
should also be removed.
Best let to get big. Not to be pruned heavy-handedly. Good
selective pruning can open them up and make them look less oppressive,
can train branches around gutters and off of houses, and can bring more
beauty out of your plant. These shrubs are the hardest to do.
Never remove more than 1/8 total leaf surface in one year. It stresses
them or it can cause a watersprout-rebound effect --- ick! Tree-likes
have stiffish branches, generally. Examples of tree-likes include
rhododendruns, andromeda (pieris), magnolias, deciduous Viburnums, camellias
and witch hazel.
Most tree-likes just need to have all of the dead wood taken out.
If you still want to do more:
Take out suckers (stright-up, skinny branches from the base and trunk of the
shrub or tree.
Take out any big crossing, rubbing branches and double leaders (two main top
branches with a narrow branch-crotch angle) on trees.
Take back or remove any branches hanging on the ground, if only up 1/2".
Take out the worst of the smaller crossing, rubbing branches --- choosing the
healthiest and best placed branch to remain.
Prune to shorten or completely remove the worst wrong-way branches that start
from the outside of the shrub, and go the wrong way back into the center and
out the other side. Sometimes a side branch has a smaller branch that
heads too far up into the next "layer", or goes too far down.
You can cut some of these off to add more definition to your shrub's branches.
If you have two parallel branches rather close together, it may look better
to remove one. If you, have three parallel branches you may want to
remove the center one. This will make things look nicer.
Before you finish, stand back and observe. If necssary, you may sparingly
shorten some branches on tree like shrubs (not trees). Cut back to a side
HINTS & TIPS
On many shrubs and trees, especially tree-likes, you want to fix things slowly
over three -to five years. Do some now, come back next year.
"Wander, ponder; and prune," the old saying goes. Pruners,
always stare at their shrubs, trying to locate unwanted branches,
imagining their shrubs without this or that branch, seeing how it
will grow next year --- seeing what needs to be done. Much like
a haircut, it's easy to take it off, hard to put back on. Know when
If a plant is really too big, you may want to move it, remove it
(go ahead, be ruthless!) or renovate it (not dealt with here).
But try real selective pruning first!
Mounds (Grab & Snip)
Comprosma (mirror plant)
Carissa (natal plum)
Cane Growers (Cut canes to the ground)
Mahonia - Oregon grape
Tree-Likes (Thin-out, many small cuts)
Osmanthus (sweet olive)
Eugenia (bush cherry)
Ligustrum japonica - privet
Murraya paniculata - orange Jessamine
Brunfelsia - yesterday, today, tomorrow
Arbutus unedo - strawberry tree
Feijoa sellowiana - pineapple guava
Pittosporum undulatum - Victoria box
Podocarpus - fern pine
Ficus nitidu & benjamina
Schinus (pepper tree)
Tough Tree-Likes (Can be sheared)
Ligustrum ovalifolium - California privet
Mistreated and Misunderstood