Page 12 - Tài liệu Ebook cây cảnh Bonsai Basics

14 HOW TREES GROW

Climate phere becomes warmer and the level of
This mainly denotes the ambient condi- humidity drops very low, the plant is
tions and in particular, the temperature likely to die. A horticultural maximum-
and humidity (moisture taken in by the minimum thermometer is available
roots and present in the air). It goes which can be placed near your bonsai.
without saying that the growth of any Only some types of tree from the
tree is directly linked to the climatic tropics need to l;>e or will tolerate being
conditions. Everyone knows that tropi- grown indoors at a high temperature,
cal vegetation differs vastly from that of above 15oC (60oF). Provided the atmos-
a temperate or cold climate. phere is humid enough, the plant is
A climate which is clement for most of watered frequently and the leaves are
the year, allows most species to grow. In frequently misted with water, these
some cases, human intervention may be tropical trees should survive.
needed, to water plants, for example, or These 'indoor' bonsai can almost be
protect them from frost, but most species considered as house plants. Some of
can be grown in the soil outdoors with- them are simply ordinary indoor plants
out much difficulty. In bonsai, this ap- treated as bonsai - plants like azaleas,
plies to all species that come from cold, fuchsias, and so on.
mountainous or temperate regions. Bon- Some genuinely tropical plants can
sai trees can and should live outdoors, also be grown under glass and treated,
provided the climatic conditions are not shaped and trained like bonsai. This
too harsh. In general this means where applies to some bamboos, which can
the temperature does not usually drop produce some very interesting effects.
below - YC (23°F). If it does (or just The distinctive elegance of the date palm
before), the bonsai should be moved (Phoenix dactyltfera) which grows as a
indoors during the cold weather, or into house plant to a height of 3 m (10 ft) or
a well-lit room, where the temperature more but can be reduced to about 30 em
never exceeds lOoC (50oF). If the atmos- (1 ft), is also worth mentioning.

Centigrade © Centigrade

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occur, so that your more delicate plants can be accurate measurement of dryness and indicate how
protected in the appropriate way beforehand. much water your plants need.