Page 195 - Tài liệu cây cảnh Bonsai4me Bonsai Basics

every two weeks between March and September when growth is stronger. Only

feed when the compost is already moist or the root-tips can be burnt. Do not feed
when the tree has lost leaves or if it is not showing new growth.
Repotting Serissa dislike rootpruning and can be left for 2-3 years at a time.
Repot in Spring as growth starts -this helps the rootsystem recover quickly. Use
a standard soil mix.
Pruning Remove suckers unless required for multiple trunk styles. Prune
back to one or two leaves to shape unless otherwise required.
Propagation Softwood cuttings in Spring or Early Summer. Semi-ripe
cuttings in late Summer. Rooting is aided with bottom heat.
Pests and diseases Scale insects. Yellowing leaves and leafdrop caused by
incorrect placement, poor humidity levels or incorrect watering.
Styles All forms except formal upright in extra-small to medium sizes.

Ulmus/ Elm Bonsai

Genus overview
Genus of about 45 species of deciduous, semi-evergreen trees occurring in
woodland, thickets and hedgerows in Northern temperate regions. Ulmus have
alternate, ovate to elliptic toothed leaves usually with very unequally sized
bases. Most species display good fall colour.

Ulmus species and in particular Ulmus parvifolia/Chinese Elm are often
confused with Zelkova species, in particular Zelkova serrata/Japanese Elm.
Zelkova are classed as a seperate genus to Ulmus as they have fruits that are
unwinged as opposed to the winged friuts of Ulmus. Zelkova also differ in that
they have single-toothed leaves whereas Ulmus have double-toothed leaves.
(Zelkova are listed under their own species guide).
The most common Ulmus species used for bonsai is the Chinese Elm /Ulmus
parvifolia, however there is no reason why any of the many Ulmus species
cannot be used.
Notes for bonsai cultivation
Ulmus parvifolia/Chinese Elm are often sold as indoor bonsai and as such
are acclimatised to indoor growing conditions, however Chinese Elms are
temperate trees and fully frost hardy. Chinese Elms grown indoors (or in
climates with very mild winters) will remain evergreen whereas outdoor
cultivation results in a deciduous tree.
Though Elms should be able to cope with the adverse growing conditions

indoors, they are never as vigorous as their outdoor counterparts. To be entirely