Hey Tim...Take a look at the yucca seedlings I have from you:
#1: filamentosa x rostrata form 2 X filamentosa x rostrata form 2
#2: [pallida x (filamentosa x elata)] X filamentosa x rostrata form 2
#3: flaccida 'ebay recurvifolia' X filamentosa x rostrata form 2
#4: [(constricta x filamentosa) x filamentosa x elata] X filamentosa x rostrata form 2
# 3 was the first one to sprout and so far the most vigorous. I yanked out an ordinary y. filamentosa out of my backyard, amended the soil with sand, and will place one of the 4 yuccas there. I can't tell the difference between them yet, but tim, since you are the father of them... can you?? which do you think would grow up to be the most robust?
I have other yuccas, all unprotected: This is y.harrimaniae 'blue gem' from High Country Gardens. only protection was spending the winter on the S side of a 5ft sand mound: it's the size of the palm of my hand still.
Yucca recurvifolia 'gold ribbons' from Ebay. Sometimes it's yellow, sometimes purple (when it's cold)
Y. gloriosa narrow leaf form. It's in the front lawn, growing a baby on the left side.
Y. gloriosa 'treculeana form'. It doesn't even know winter came. it's the largest of them all.
Y. gloriosa 'variegata' from Lowes (monrovia pot). I just planted it out to replace a dead faxoniana in the front lawn.
Y. recurvifolia 'margarita'. Aside from some spotting, it did great with a low of -5F last winter. This gets huge at the NYBotanical Garden.
And this is what's left of my Sabal Minor 'McCurtain' that I planted last summer. Actually there are 2 of them, and the other one looks the same. They are alive and starting to unfurl damaged leaves (I cut off the dead fronds). How many fronds a season do McCurtains flush? Does fertilizer help?