Den. lindlii bud blasting

[Jambon]

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.

[Jambon]

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

[estación seca]

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.

[Jambon]

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.

[Canadienne]

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.