Hi all. I decided to make a better effort at making some hybrids using my Yucca this year. I 'think' I have seeds of the following (All of these Yucca are growing in my USDA zone 4 garden; hybridity is not guarenteed since the gloriosa made seeds on their own, not so the glauca):
Yucca glauca v. stricta (not-seed grown) x Y. gloriosa
Y. gloriosa 'Best Form' x Y. glauca v. stricta (was Y. elata- Seed grown)
Y. gloriosa 'Best form' O.P.
I also have seeds from a number of different Y. gloriosa, and Y. arkansana. These are OP and should not be considered true breeding IMO.
All in all not a bad summer, far too dry here for most things, but the Cacti did really well.
Y. gloriosa best form (back left): https://flic.kr/p/JYeBSz
Yucca glauca v. stricta (was Y. elata seed grown): https://flic.kr/p/Hp3SYX https://flic.kr/p/HzE3Ks
Yucca glauca v. stricta (not seed grown) https://flic.kr/p/H5fcCU