Yucca Fax & Mags
Jeff, thanks for posting those yuccas. Yes they are Yucca Faxoniana and I've known about them for a number of years. Joe from Triple Oaks told me about them at least 5 or 6 years ago. Glassboro isn't too far from me either, it's about 15 miles or so N-NW of me.
My wife surprised me with a Yucca Fax for Christmas in 2012. Actually she bought me a Rostrata and thought it was the yucca I wanted. She got it from Hogbins on the BHP and since I know the owner there I called him to see if I could exchange it for a Fax. It stands close to 5 feet tall with about a foot or more of clear trunk. I kept it inside from Christmas '12 until planted on 3/17/13. As you know last winter was about the most extreme test it could have had for its first winter, but came through fine. I made sure that even though I have very sandy soil, I planted it in gravel and play sand mixed in with native soil. I also have a few inches of pure pea pebble gravel at the base to keep the trunk from getting too wet in the winter at the soil line. So far so good. Don't forget about those big Faxoniana's planted in someone's yard right off the Parkway at mile marker 8.3 in Cape May Courthouse. They have been there for close to 30 years now, maybe longer.
Regarding the comment about Mags in South Jersey with snow and ice. Mags have been growing in the SW part of the state for years and have managed to come through some very snowy and icy winters. Do some limbs break? Yes, but not enough to kill the trees. It really is amazing how many mags you'll see in Gloucester, Salem and Cumberland counties compared to the rest of South Jersey.