Den. lindlii bud blasting
 

I have this den. Lindlii with 2 flower spikes forming. The flowers are the size of a grain of rice. Some appear to be turning a yellowish color. I have been increasing the watering and light fertilizer slightly. I grow them in the green house here in Southern Ontario CA. Should I be less generous with my watering for now? Is it wanting more sun? Thank you all.

Den. Lindleyi bud blast
 

I am trying to add a pic. Of the flower spikes.

That could be caused by lack of water, excessive temperature swings, low humidity or exposure to ethylene from ripening bananas or apples, or natural gas for heating.

It is the first time I got this one to bloom, here's hoping I get to enjoy a few flowers😏. We do do get some temp swings, but I put the shade cloth on which should help.
And thank you for the advice.

I hope you have some heating in your greenhouse as the temps here in southern Ontario have been pretty cold through the nights. Tonight your looking at -4C yet.
I have mine in a sunny south window in the house where the temp swings about 8 degrees Celsius and haven’t seen dendrobium bud blast in years. They stay indoors all winter till about half of may when they go outside if weather is agreeing.