Overview:
There are more than 8000 Fuchsia hybrids and cultivars available
at present, many of which have potential for bonsai cultivation.
I would however recommend using varieties that are reliably hardy
for ease of cultivation and vigour in your climate. Though leaf
size can be reduced, flower size cannot, and small flowered varieties
are preferable. Suitable varieties include Fuchsia microphylla,
F.'Tom Thumb' and F. 'Lady Thumb'. The most hardy and reliable
variety for bonsai are members of the Fuchsia magellanica species.
Try to avoid variegated forms as they are weaker and have a tendency
to revert in poor light.
Fuchsia magellanica is a fast growing deciduous/evergreen
shrub that has 1-2" leaves, producing abundant red and purple
flowers throughout the growing season. In the following notes
I will be referring to F.Magellanica specifically though other
varieties should be cultivated in much the same way, as long as
care is taken with differing frost hardiness. Specimens of F.magellanica
can produce trunks of over 4-5" in less than 5 years if grown
first in the ground prior to bonsai training. Fuchsias are suited
to informal upright and cascade styles in small to medium sizes.
General Cultivation: Fuchsia are outdoor trees for
much of the year.
Placement
in full sun will encourage flower production at the expense of
vegetative (foliage) growth; if the tree is still in training,
it is worth providing some shade to encourage new shoots at the
expense of flowers.
Fuchsia hardiness is variable depending on particular species.
Fuchsia magellanica though is reliably hardy down to around -3°C(27
F). Temperatures below this will cause rapid leaf fall and can,
on occasions, cause dieback of the branches, though the root system
will tolerate temperatures of -10° centigrade (14 F) or less.
Specimens do require a dormancy otherwise they lose their vigour.
It is advisable to leave trees outside until at least the first
frosts of the Autumn and then move to a light, frost-free position
for the remainder of the winter.
After
all possibility of frost has passed in mid-spring, place the tree
back outside in full sun (though a little protection from the
mid-day sun in the height of summer is advisable). Fuchsias enjoy
high humidity levels and regular misting is necessary during high
outdoor temperatures, however they dislike overly-wet compost
and over-watering should be avoided. Growth is not prompted in
the Spring until day-time temperatures reach 10 degrees centigrade
(50 F) on a daily basis. This can result in plants not exhibiting
growth until as late as May or June in cooler climates. Plants
not showing new growth until this time should not be regarded
as having died.
Repotting: Fuchsia should be repotted annually as root
growth is very vigorous. Use a basic soil mix.
Pruning: Fuchsia require weekly pinching during the
summer to slow over-vigorous shoots and to reduce leaf size and
increase ramification. As Fuchsia produce flower buds on a continual
basis throughout the growing season, maintenance pruning will
not reduce flower numbers significantly.
It is recommended that trees requiring strong trunk or branch
growth have their flower buds removed continually to conserve
strength for growth. Fuchsias have a tendency to sprout suckers
from the roots and these should be removed.
Wiring: Due to their vigour and prolific budding, Fuchsia
require little wiring as they are easily pruned to shape. Young
shoots thicken rapidly so any wire applied must be watched closely
to avoid wire-marks. Once growth has hardened off it becomes brittle.
Propagation: Fuchsia are very easy to propagate, softwood
cuttings can be taken in Spring or semi-ripe cuttings can be taken
in late Summer. Better strike-rates are achieved from non-flowering
branches.
Large
specimens are easily collected from gardens. As Fuchsia have thick
fleshy rhizomatous root systems, large stumps will readily root
if planted in free-draining soil during early Spring.
Pests and Diseases: Fuchsia are susceptible to aphids
and regular inspection should be carried out. Trees experiencing
wet soil conditions and poor air circulation are more susceptible
to attacks of mildew and should be sprayed with fungicides.