Dendrobium Burana Pearl, Sonia, Burana Pink in bloom

[NYCorchidman]

I once ran across a nice list blue flowers, but have no idea what they were.
I personally had some plants that had true blue color flowers with no hint of purple.
Two nice examples are hyacinth (I think it was delft blue is the variety name, it's pale, pastel blue) and blue daisy, this is kind of generic name. It has nice sky blue petals with bright golden center.

Regarding your dens, well, if you've grown them in your setting for a number of years and they have survived fine, then I guess it's fine for them.
The ones with more biggibum or round flower shape take cooler temperature better than skinny flowered plants as these are naturally growing at a latitude closer to the equator.
I think the key is keeping them dry when the temp is low, like under 60F is very low for them I think.

You changed your main photo from pink miltoniopsis to this cattleya. started to buy some cattleyas now?