The Phalaenopsis pot plants is
popular in flower market and double spikes is the basic requirement for
this orchid. How to obtain double spikes of Phalaenopsis pot
plants? Four kinds of factors determine the percentage of double spikes
I. Factors affecting spiking
1. The genetic characteristics of
Some varieties are only one spike in
blooming stage by their genetic characteristics. Some varieties are
low-temperature varieties, that is, the adequate day and night
temperatures at culture stage need to maintain lower temperature. The
only method to induce spiking by cooling effect is to reduce the day
temperature. Too low night temperature will damage the orchids. So only
one spike could be induced.
The variety with two spikes or more
spikes is called high-temperature varieties. The culture temperature of
day and night required higher temperature. The typical variety is Sogo
Yukidian V3. The adequate temperature at day and night is 28~33℃ and
24~26℃, respectively. If the cooling room maintains at <22℃ at day and
<18℃ at night. It will be induced two or more spikes easily.
The basic requirement is the virus-free
plants. No pest and disease was found in plants.
In the growing stage, the water and
fertilization technique must be well done, the roots are grow well and
no salt accumulation. The accumulation of dry materials (carbon
available) in leaves and node is enough.
3. Pre-treatment of plants before
The spiking pretreatment is performed in
one month before send to cooling rooms. The pre-treatment is to increase
the day temperature (higher 2~3℃ than culture stage), and light
intensity (increase 10~15%) in the greenhouse. The fertilizer change
form 20-20-20 (N-P-K) to 10-30-20.
4. Cooling environment
The day and night temperature need to
recluse 6℃~8℃ than that of culture stage. For example, the temperature
at day and night is 28℃ and 26℃ in culture section, then the temperature
at day and night is 20℃ and 18℃ in cooling section of greenhouse.
The light level could be maintain at
a. Change the fertilizer concentration
form 10-20-20 to 20-20-20
If the mature plants are send to
destination by long-term sea transportation. These plant are adopted the
lower temperature environment. If they are send to cooling room without
recovery treatment, the cooling stress for plants is limited. The number
of spikes or the spiking percentage will decrease.
In USA, many orchid companies take out
plants form sea container and place these plants into cooling room
directly. They want to save time and space of greenhouse for production.
However, the quantity and quality of flowers is lose.