What triggers or initiates spike growth on phalaenopsis is cool night temperatures of around 25 degree C for several weeks.A temperature of 32 degrees, even for a short time, will prevent spiking.
so my phalaenopsis plant grows quite well, but doesn’t bloom reason could be too high temperature. We find that phalaenopsis flower quite well at 16.5 degree C. If you are growing the plants indoors, artificial lights nearby might cause long days and thus inhibit flowering. If the plants seem to be growing well, water and fertilizer applied as directed, temperature ideal, and still no flowers, then not enough light is probably the answer. Gradually increase the light intensity . If growing in the home, move the plants to a nice, bright windowsill.
so What triggers or initiates spike growth on phals is cool night temperatures for several weeks. But, prior to this, it should have been growing and building up nutrient reserves within its leafs. This brings up a concern about how healthy the plant is, whether the leafs are full and firm (healthy) or somewhat limp and droopy (unhealthy).
1)Some Phal species do not require temperature drop to initiate spike.
2)Timing these is very important for the cut flower industry. The nurseries that fill those markets grow their Phals in extremely dense shade–just a little more light than you’d get on a clear night with a full moon–for several months under tarps. When the tarps are removed and normal light levels restored, the plants spike within two weeks.
The darkness delays the normal spike season for the particular type of plant. In other words, if you have a Phal that normally spikes in December, and you want it to spike in March, you could drastically reduce light levels in mid November, then restore them in March to make the plant spike.
3) study points to the possibility of using intermittent high temperatures to prevent spiking. By applying cycles of 1 to 3 weeks of reduced temperatures (down to 59°F or 15°C) followed by 1 week of high temperature to inhibit spiking between late fall and early spring, it may lower the cost of inhibiting spiking by using constant 82°F (28°C).