Page 194 - Tài liệu cây cảnh Bonsai4me Bonsai Basics

thousand stars'.

There are now quite a variety of forms of S. foetida in cultivation that carry
variegated leaves with single or double flowers.
Though very commonly found for sale at bonsai establishments throughout
Britain and Europe, the Serissa is notorious for being hard to keep for both
experienced hobbyists and beginners alike. The Serissa has a tendency to
yellowing and dropping leaves if correct growing conditions are not kept.
Being a subtropical species Serissa have to be protected from temperatures
below 7°C which means indoor cultivation is required in most areas of Europe
and America for a good proportion of the year. However, here lies the heart of
the problem with this species; it is difficult to keep up the humidity levels
required by Serissa in an indoor environment and this often causes the tree to
suffer.
Bonsai cultivation notes
Position Outside when day and night temperatures stay reliably above 7°C;
in Britain this means from late May to mid-September. It is important for the
health of the tree to spend at least a few weeks each year outside, however,

ensure that the tree is not moved around too much once outside.
Indoor cultivation; when temperatures threaten to dip below 7°C (day or
night). Find a bright but not too sunny permanent position out of cold draughts,
for instance on a East or West facing windowsill. Good humidity levels must be
maintained and can be provided by the use of a humidity tray. Never place the
tree on a windowsill above a radiator, (radiators/central heating are the primary
reason that indoor cultivation is so difficult as they dry the air considerably) do
not place the tree on a windowsill where the curtains are closed at night as this
environment can experience very cold temperatures at night during the winter.
Moving the tree to a new position will stress the tree until it acclimatizes, on
occasions causing yellowing and dropping leaves-this should be followed within
a few days by fresh growth.
Watering Serissa strongly dislike continually wet roots though bone dry

compost will also kill them. Water thoroughly (ensure your compost medium is
well drained) and do not water again until the compost has NEARLY dried out.
Daily watering as a routine should not be carried out unless necessary though
daily check the soil daily. Ensure the gravel tray is kept continually wet but
never allow the pot to be stood in water.
Yellow leaves can often indicate overwatering (though this can also be due
to other factors), brown and crispy leaves indicate lack of water or lack of
humidity.
Feeding Feed once a month during the winter (September to March) and