Thx for the update. The seedlings look really healthy.......your doing a great job.
All the names you posted seem correct as my 'filamentosa x rostrata' was a pollen donor to many blooming Yuccas.
The 'Tennessee Big Bloom' in my garden is from you. It has a massive bloom, thx buddy.
Do you see any with obvious rostrata genes in those seedlings ? I hope so since rostrata genes make good looking hybrids.
Thx for the confederate rose, one of the cuttings has formed a root. It will go outside this weekend.