The Art of Bonsai.pdf
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426-601x
Virginia
Cooperative
Extension
The Art of Bonsai
Diane Relf, Extension Specialist, Horticulture, Virginia Tech
Environmental
Horticulture
B
onsai is an art form that stems from ancient
Bonsai can be classified into about 10 basic styles,
of which the most common are; formal upright,
informal upright, slanting, cascade, and semicas-
cade. These classifications are based on the over-
all shape of the tree and how much the trunk slants
away from an imaginary vertical axis.
Publication 426-601
Revised 2001
Asian culture, originating in China and devel-
oped by the Japanese. In the 13th century, the
Japanese collected and potted wild trees that had
been dwarfed by nature. These naturally formed
miniatures were some of the first bonsai.
A bonsai (pronounced "bones-eye") is literally a
"tree in a pot," which further imitates, in minia-
ture, the appearance of an old tree in nature. Old
specimens in nature, unlike juvenile trees, have
compact rounded tops, and horizontal or drooping
branches, which make them appear aged and
graceful. There are three sizes of bonsai, ranging
from under 5 inches to about 30 inches in height.
is one type that is con-
sidered to be easy for the
novice bonsai grower.
This style features a
straight trunk and a bot-
tom branch that is lower
and extends farther
from the trunk than the
opposite branch.
Not all plants are equally effective as bonsai. To
produce a realistic illusion of a mature tree, all
parts of the ideal bonsai - trunk, branches, twigs,
leaves, flowers, fruits, buds, roots - should be in
perfect proportion with the size of the tree. Plants
used for bonsai should have small leaves or leaves
that become small under bonsai culture. Plants
with overly large leaves, such as the avocado, will
look out of proportion if chosen for bonsai.
Sycamores also develop leaves that are too large.
Certain species of both maple and elm trees usu-
ally respond well to bonsai culture and develop
leaves that are in proportion. Among the plants
with small leaves and needles appropriate for bon-
sai are spruce, pine, zelkova, and pomegranate.
Leaves will miniaturize naturally the longer a tree
grows in a shallow container, but one must still
begin with a relatively small-leafed type.
is the best choice for
beginners since creation of
this type teaches the most
about bonsai design. The
trunk is upright, but curving
rather than straight, usually
forming a zig-zag pyramidal
shape. Major branches occur
at the angles where the trunk
bends, and the apex is
aligned over the base of the
trunk regardless of the directional shifts in the
trunk. Achieving the alignment of trunk base and
apex makes the tree asymmetrically balanced.
VIRGINIA STATE UNIVERSITY
Plants chosen for bonsai should have attractive
bark, and the trunk must give the illusion of matu-
rity. The trunk should have girth, but must remain
in proportion to the entire tree and should taper
gradually toward the top of the tree. An ideal trunk
has good buttress rootage at the base, and graceful
movement as it rises to the apex.
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Issued in furtherance of Cooperative
Extension work, Virginia Polytechnic
Institute and State University, Virginia
State University, and the U.S.
Department of Agriculture cooperating
J. David Barrett, Director, Virginia
Cooperative Extension, Virginia Tech,
Blacksburg;
Lorenza W. Lyons, Administrator, 1890
Extension Program, Virginia State,
Petersburg.
Branches that occur lower down on the trunk
should be the longest, and biggest in diameter,
with branches growing higher on the trunk
becoming successively shorter and smaller in
diameter. This imitates the natural appearance of a
tree, suggesting that the lowest branches are the
oldest (biggest/longest), and higher branches,
having grown more recently, are smaller and
shorter.
the trunk has a sin-
gle more acute angle
than in the informal
upright style. The lowest branch
spreads in a direction opposite to
that in which the tree slants.
VT/028/0201/2M/21XXXX/426601
1
T
he formal upright style
T
he informal upright style
I
n the slanting style,
style of bon-
sai represents a
natural
tree
growing down
the face of an
embankment. A
cascaded plant-
ing usually
looks best in a deep round
or hexagonal container.
HORNBEAM:
American,
Carpinus
caroliniana
(for large bonsai);
Korean,
Carpinus coreana;
Japanese,
Carpinus japonica
IVY:
English ivy,
Hedera helix
and
cultivars
MAPLE:
Japanese,
Acer palmatum
(use palmate rather than dissectum
type, preferably a seedling, not a
grafted tree); Amur,
Acer ginnala;
Hedge,
Acer campestre;
Trident,
Acer
buergeranum
OAK:
Willow oak,
Quercus phellos
PINE:
Austrian,
Pinus nigra
Bristlecone,
Pinus aristata
Japanese red,
Pinus densiflora
Japanese white,
Pinus parviflora
Japanese black,
Pinus thunbergiana
Mugo,
Pinus mugo
Scots(Scotch),
Pinus sylvestris
Swiss stone,
Pinus cembra
White,
Pinus strobus
(dwarf varieties)
WISTERIA:
Japanese,
Wisteria flori-
bunda
YEW:
Taxus
species and cultivars
ZELKOVA
: Japanese,
Zelkova
serrata
merican gardeners have taken
bonsai concepts and applied them to
houseplants. By combining traditional
procedures for handling houseplants
with bonsai concepts of design, grow-
ers have created different bonsai
styles. The following woody plants
(native to the tropics and subtropics of
the world) have been grown as indoor
bonsai. These plants can be obtained
from either local or specialized nurs-
eries.
HERB:
Elfin,
Cuphea hypssopifolia
HIBISCUS:
Chinese hibiscus,
Hibiscus rosa-sinensis
`Cooperi'
HOLLY:
Miniature,
Malpighia
coccigera
JACARANDA:
Jacaranda acutifolia
JADE:
Crassula
species
JASMINE:
Jasminum parkeri;
Orange,
Murraea paniculata;
Confederate star,
Trachelospermum
jasminoides
LAUREL:
Indian,
Ficus retusa
MYRTLE:
Classic,
Myrtus communis
OAK:
Cork,
Quercus suber;
Silk,
Grevillea robusta
ORCHID TREE:
Bauhinia variegata
OLIVE:
Common,
Olea europaea
PEPPER TREE:
California,
Schinus
molle
PLUM:
Natal,
Carissa grandiflora
POINCIANA
: Royal,
Delonix regia
POMEGRANATE:
Dwarf,
Punica
granatum
'Nana'
POPINAC:
White,
Leucaena glauca
POWDERPUFF TREE:
Calliandra
surinamensis
SERISSA
(Snow Rose, Tree of a
Thousand Stars):
Serissa foetida
(nicest of all indoor
bonsai)
cascade style has a
curving trunk that does
not reach the bottom of
the container as in the cascade style.
Prostrate junipers and flowering plants
adapt well to both of these styles.
T
he semi-
Bonsai Plant Guide
A
Trees and shrubs are suitable for tradition-
al bonsai. Specialty nurseries often have a
wide selection of dwarf and semidwarf
varieties of many species. Dwarf plants,
however, do not always convey the same
impression as their full size counterparts
because their growth habits are quite dif-
ferent. Some trees and shrubs that work
well as bonsai are azalea, beech, boxwood,
ginkgo, maple, oak, pine, wisteria, and
zelkova.
Creating Your Own
Plant Selection
It is safest to begin with common plants
that do well in your area. Be sure that the
plants you consider meet the requirements
for good bonsai. Some old favorites for
bonsai specimens are Sargent juniper
(
Juniperus chinensis
'Sargentii'), Japanese
black pine (
Pinus thunbergiana
), Japanese
wisteria (
Wisteria floribunda
), Chinese
wisteria (
Wisteria sinensis
), Japanese
flowering cherry (
Prunus yedoensis
), and
Japanese or sawleaf zelkova (
Zelkova ser-
rata
). Nursery stock can be a very good
selection since the plant's roots have
already become accustomed to being con-
tainerized. Look for well-rooted specimens
with good branches.
AZALEA
: Hiryu,
Rhododendron
obtusum;
Satsuki azalea,
Rhododendron indicum;
Kurume,
Rhododendron obtusum
BEECH
: American,
Fagus grandifo-
lia;
European,
Fagus sylvatica
BOXWOOD
:
Buxus
species
ELM
: Chinese,
Ulmus parvifolia
(many small-leaved cultivars)
FIRETHORN:
Pyracantha
species
GINKGO:
Ginkgo biloba
HAWTHORN:
English,
Crataegus
laevigata;
Washington,
Crataegus
phaenopyrum
HEATHER:
Scotch heather,
Calluna
vulgaris
ACACIA:
Acacia baileyana
ARALIA:
Balfour,
Polyscias bal-
fouriana;
Ming,
Polyscias fruticosa;
Geranium-leaf,
Polyscias guilfoylei
CAMELLIA:
Common,
Camellia
japonica;
Sasanqua,
Camellia sasan-
qua
CITRUS:
Citrus species (calamondin,
kumquat, lemon, lime, orange, and
tangerine)
CHERRY:
Surinam,
Eugenia uniflora
CYPRESS:
Monterey,
Cupressus
macrocarpa
FIG:
Mistletoe,
Ficus diversifolia
Plants for bonsai can be collected from the
wild, but it is a slow method and there are
many unknown factors. It is difficult to tell
2
T
he cascade
Bonsai
the age of a plant found in the wild and since they must be col-
lected while dormant, it is also difficult to be sure that the speci-
men is healthy. Take all the equipment needed to keep the plant in
good condition after digging. This includes plastic bags to wrap
the root ball, moss to pack around the roots, and water to keep the
specimen moist if it cannot be replanted soon after digging. Don't
forget the crowbar; roots are sometimes wrapped securely around
rocks.
called "ramification"). Pruning is less stressful for the tree than
wiring, but both are usually necessary to achieve refinement.
Pruning should be done with a concave cutter, a special bonsai
tool for making sharp cuts without collars (stubs). All but main-
tenance pruning should be done at the same time of year as root
pruning in order to maintain a supply-and-demand balance
between foliage and roots. Deciduous trees can be pruned back
quite severely if an equivalent amount of root is removed at the
same time. Older evergreens should be pruned back very gradu-
ally. Starting at the bottom of the trunk, remove branches that are
growing straight up, those that grow inward towards the trunk,
and one of two branches that grow opposite one another, after
selecting the correct one to keep, usually according to an alternat-
ing (side-to-side) arrangement of branches that start near the bot-
tom. Only after wiring should you prune to shorten remaining
branches, leaving lower ones longer than upper ones.
Be sure to have permission before digging plants on property
other than your own, and don't forget to check the endangered
species list for protected plants before you begin. It is not legal to
take plants from national parks and other conserved areas.
After the plant is selected, dug, and brought home, plant it in a
protected area in your garden. Water the plant and feed it sparing-
ly. After one year, it is ready to be placed in a training container.
A light pruning of the branches can take place at potting time, but
training should not begin for another year.
Wiring can be done at any time of year, but it is most easily done
on deciduous trees in the winter when they have no leaves. Buy
annealed aluminum or copper wire made for use on bonsai, which
is much more pliable than regular wire.
It is possible to propagate your own bonsai. It is a slow method,
but it has the advantage of letting you shape the plant from the
very beginning. Plant seedlings in the ground outside so that the
trunks will develop rapidly. They may need to stay outdoors for
two to five years. Each spring, dig up the plant and prune its roots
as you would if it were potted.
To make the branches flexible before wiring, do not water the
plant the day before you wire it. Begin at the bottom of the tree
when wiring and shaping, and work upward. Anchor the end of
the wire at the base of the tree by pushing it into the soil. Use foam
pads under the wire to protect the branches. Keep turns around the
branches or trunk about one quarter inch apart, and spiral upward
at a 45 degree angle. Do not wire too tightly. If a branch should
snap, the ends can be rejoined if not completely broken. Wind
some garden tape around the break. If a branch snaps off, prune it
back at the first side branch. Wire should not be kept on the plant
longer than one growing season. When removing wire, start at the
end of the branch and work back carefully.
Bonsai can also be started from cuttings. Make cuttings in late
spring before the buds open. Some plants that propagate easily
from cuttings are olive, willow, cotoneaster, firethorn, azalea, and
boxwood. Plants can also be propagated by layering and grafting,
but these methods are not recommended for the beginner.
The Front View
Choose a front view for the bonsai from which the trunk is most
advantageously displayed, and from which the tree will be exhib-
ited. Approximately the lower half of the trunk should be visible
without branches except to the sides from the front view. Be cer-
tain, however, that the tree has good three-dimensional develop-
ment on the sides and in back.
Bonsai Containers
All bonsai begin their develop-
ment in training pots, where
they stay until they
have a good,
fibrous root system
and relatively full
foliage develop-
ment which make
them look like bonsai rather
than just a shrub or tree in a
pot. Training pots help trees grown for bonsai make the transition
between a deep nursery container, a balled and burlapped root sys-
tem, or landscape, to the shallow confinement of a bonsai pot.
Above all, resist the urge to collect (dig) a tree and put it directly
into a bonsai pot, where its chances of survival are slight. The
best sort of training pot is often a large-diameter nursery contain-
er with good drainage holes, and with its top cut off to a depth of
8-10 inches. During its time in a training pot, the tree should be
grown in coarse, fast-draining soil. Traditional bonsai pots, avail-
able at bonsai nurseries, and some large nurseries and import
stores, are round, oval, square, rectangular or hexagonal. Some
are unglazed on the exterior (traditional for evergreens) and some
Shaping the Bonsai
Before deciding on the shape of
your bonsai, study the tree
carefully and take into
account the natural form of
the species. To achieve an
impression of age and reality,
observe the way mature trees of the
same kind grow in their natural set-
ting. Decide on the final shape and
size of your bonsai before beginning.
Make a rough sketch of what you
wish to create, and use it as a guide.
Bonsai are shaped by pruning, wiring and pinching. Pruning and
wiring create the tree's structure by shaping its woody parts,
whereas pinching back the long ends of soft foliage helps side
buds to develop, making a branch bushier or twiggier (this is
3
are glazed and are suitable for most types of trees, as long as the
pot complements but does not compete with the tree. Pots for cas-
cade, semi-cascade and flowering bonsai are deeper than others.
All bonsai pots have large drainage holes, which are essential for
the rapid drainage that promotes root health, but which must be
covered with screening on the inside bottom of the pot to prevent
coarse soil from washing away with draining water. Bonsai con-
tainers should be unglazed on their inside walls, and on the bot-
toms, both inside and out.
In the fall, bonsai must be prepared for the winter. Slow the growth
of the plants by watering less frequently and discontinuing fertiliz-
er application. Do not prune or cut any branches after mid-August.
Winter's low temperatures and drying winds can easily kill bonsai.
If the winter temperature drops below 28º F, bonsai must be pro-
tected by a greenhouse, pit, or coldframe. However, do not over-
protect the plants; they must be kept cool to stay dormant. Don't
forget to water them while inside the coldframe. Winter watering
may be necessary only once a week. More bonsai are killed by
overwatering than by desiccation.
Before repotting, familiarize yourself with the proper time of year
to repot specific types of trees. For example, junipers can be
repotted at any time during the growing season because they grow
throughout it. Pines and most other evergreens must be repotted
during the late winter before they show signs of new growth.
Most deciduous trees should be repotted before they leaf out in
very early spring.
In the spring, start new bonsai, prune the old ones, and continue
training measures. The remaining part of the growing season is
used for the plants' adjustments to these practices.
Displaying Bonsai
R
emember that simplicity is very important in Japanese aes-
A bonsai that is ready for a bonsai pot should not be transplanted
into it until all foliage work (pruning, wiring, pinching) has been
completed. This precaution prevents the tree's newly placed roots
from being dislodged. At the time of "potting up," turn the bon-
sai container so that its front side (essentially the same for all
shapes except rectangular, in which case only one of the two long
sides should be the front) is toward you roughly at eye-level.
Hold the tree with its front view toward you and place the base of
the trunk very slightly off-center to the opposite side from which
the dominant visual weight of its branches occurs. In other words,
if most branches occur on the left when viewing the tree from the
front, place the base of the trunk slightly off-center to the right.
This maintains the asymmetrical balance that is the basis of
Japanese design. Comb out the roots, pruning back (shortening)
those that have become wiry or stiff deep in the soil. Keep, but
trim, fibrous roots and spread them out inside the container. Add
coarse porous soil such as Turface (a soil amendment), or "soilless
soil," which can be purchased at large landscape supply business-
es. Water the tree thoroughly and keep it in a dry protected place
for the next few days. Check it for soil moisture daily, but do not
water it until the soil on top begins to feel a bit dry.
thetics and bonsai should be displayed in an uncluttered envi-
ronment where the details of the plant can be appreciated. This is,
after all, a wonder of nature - trees and shrubs made miniature.
Gravel beds in the garden are good backgrounds for bonsai out-
doors, and a simple stand or table before a blank wall makes an
appropriate setting indoors. Make sure that the front view faces
the viewer.
When visiting the Washington, D.C. area, be sure to visit the bon-
sai collection at the National Arboretum. There are beautiful spec-
imens on display that are hundreds of years old. The setting of the
display is especially appropriate and may give you ideas for your
own bonsai projects.
(Originally adapted for use in Virginia from USDA H & G
Bulletin #206, and amended and updated in January 2001 by
Jerrie Pike of Higo Gardens Bonsai, Christiansburg, VA)
periods of time when they may be brought inside for viewing.
These indoor periods should only be for two or three hours and
should not occur at all in summer unless the interior is well venti-
lated.
In the summer, bonsai need cool nights, sunny days, and mist or
rain almost daily. If your climate does not offer these conditions
naturally, you must supply them. Avoid any extremes in tempera-
ture, light, rain, and wind. Water the entire plant daily, but do not
let them become water logged. Placing bonsai on a slatted stand in
the garden is a good way to keep drainage conditions optimum.
Learn the conditions (culture) that your bonsai requires. Junipers
and pines need full sun all day. Maples, elms and boxwoods need
morning sun and afternoon shade, etc.
Apply fertilizer only before and during active growth. A houseplant
fertilizer diluted from one quarter to one half strength will suffice.
4
Seasonal Care
B
onsai from forest trees must live outdoors except for short
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