I need to check my notes during a weekend... and will let you know.
As for the reverchonii - it's true!!!

That's a lot of Yucca sp. Igor!
I also agree with previous ID - it's Yucca reverchonii. I have mine from seed ordered as Yucca rupicola 1999.5 - Ozona, Tx (Mesa Garden),but is turn to be Yucca reverchonii.

Hello Igor,

Welcome to this forum of "Yuccaholics". Your seedlings looks great. I thought, that I lived in a harsh climate, but I can see, that your Yucca have very low temperatures to deal with, but they are fortunate with a good long growing season.

Keep us informed with the development of your plants.

Best wishes

Benny, Northern Denmark, where we expect the years first day with temperature just above 25C, no clouds and an UV of almost 7, this will give the Yuccas a boost and the pale plants gets some "blue hue" back on their leaves.

Hello Igor!
I wish I had the space to grow so many yuccas.......congrats on your seedlings, good growth!

Thanks a lot for a very warm welcoming everyone! This week I started re-planting my seedlings to growing pots in order to prepare for building the yucca/cacti bed. Hope to finish construction before winter comes. All plants will be keeping inside of unheated GH until next spring. Once the seedlings will have been being re-planted I'll get a chance taking pictures of each single plant for more detailed identification.

Tim, you are right there were seeds of Y. filata 'big mama' X 'constricta x filamentosa' among those you sent me a few years ago.
As for another plant you asked about it is not anguistissima but aguistifolia though.
About reverchonii it looks like I have two different varieties of that one. One has more bluish leaves while another one has greenish leaves.

I'm not sure what angustifolia is? Is that angustissima x recurvifolia? Sounds nice.

I'm glad you have some of the filamentosa x constricta X filata 'big mama'. The seedlings I have seem very aggressive and happy

The blue form of reverchonii may have some pallida genes in it. I'm sure it's a beauty👍