The nursery trade has numerous examples of misnaming. To be clear, I am not defending this fact but merely reporting it. snip What must never be forgotten is that a name is ultimately just a name - meaning that what matters above all is appreciation for a plant or plants should reign supreme. Sorry...

I had it survive -5C outside here. The only time I have seen it in habitat there was a freezing fog outside (at the edge of the national park on Tenerife, around 2000m) and around -2C. Tricky to grow!

This came up before and I am afraid I may have offended a few people back then: http://www.bcss.org.uk/foruma/viewtopic.php?f=1&t=154171&p=184702&hilit=zwartkop#p184702 Well, same again, folks! That site is setting itself up as something 'official' but is just nonsense. Worse, it is nons...

We seem to be drifting off topic here. The OP was with regard to tree-like yucca for north-western Europe gardens, and specifically Aiko's own garden in The Netherlands. Trunkless yucca and other Asparagaceae could make a thread all of their own - there are scores of candidates! Trunked yuccas not s...

Yucca schottii would be no problem at all. One of the finest collection of outdoor yucca in Europe resides just northeast of Antwerp and his plant of this species is in rude health, having shrugged off a -22C in winter 2010. Of the others I think schidigera and torreyi might be ok, especially if pro...

Goodness only knows how you should pronounce 'huitzilopochtlii'. I'd say 'wit-sil-lo-poch-tlee' based on my scant knowledge of how Mexican words/place names are spelt and pronounced after several field trips trying to ask my way to various places :smile: . All vowels are short, so the 'o' as in 'bo...

'Best' is always going to be subjective. it also depends upon what you want from your echeverias - in my case hardiness for growing outside. I possibly wouldn't make it up to 10 but my top plant would be Echeveria elegans which has proved indestructible for the best part of 20 years. It bulks up ver...

No reason why it shouldn't flower if you can keep it alive long enough. Keeping it under-potted and 'stressed' would probably speed it up.

I think it is Agave sisalana, a yucca-like, trunk forming agave sp.

Gosh, what a wonderful problem to have - one of the rarest and most special plants of that age. Without knowing the construction of your glasshouse, might it be possible to put some some of roof lantern across the top to give extra height? I googled 'greenhouse roof lantern' and came up with a vast ...