Here is a picture of some of the dioon I purchased at YuccaDo this past summer. Although they are supposed to be cold tolerant, I thought it best to take a photo in case they don't make it through the winter. 
I understand that I will probably lose the leaflets but the woolly trunk is soft and just seems really fragile so in the event of really cold weather, I will cover the base of the plants. If anyone has other suggestions, please let me know.
Pictured below are four of the Yuccado dioon edule, three jacala form and 1 rio verde:
dioon edule x 4.jpg (105.55 KiB) Viewed 5169 times

I understand that I will probably lose the leaflets but the woolly trunk is soft and just seems really fragile so in the event of really cold weather, I will cover the base of the plants. If anyone has other suggestions, please let me know.
Pictured below are four of the Yuccado dioon edule, three jacala form and 1 rio verde:
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