Page 130 - Tài liệu cây cảnh Bonsai4me Bonsai Basics

Informal upright wild English Oak. Note this does not have a triangular
silhouette.
Formal Upright Form
In this form the trunk is completely straight and upright. Previously a
popular form amongst enthusiasts but now much less commonly seen. The
majority of upright bonsai have some movement that make them informal

uprights.
Ideally the trunk should display an even taper from base to apex. This form
replicates trees growing unimpeded in open growing conditions without
competition from other trees. The branches leave the trunk alternatively from left
to right to back and no branches face the front until the top third of the tree. All
the branches will be mainly horizontal or slightly drooping as if weighed down
by snow in winter. This can be a difficult form to carry out convincingly and it is
recommended that only trees with a naturally straight trunk be used. The
silhouette of a formal upright is triangular though not strictly symmetrical.
Deciduous species are unsuitable as formal uprights. Coniferous species such
as Yew, Swamp Cypress and Cryptomeria make good candidates.