A much better alternative to Agave americana if you want a large spiky rosette. Non aggressive and does not rot in the rain.
An attractive bluish palm. Plods along quite nicely, unperturbed by cold or rain. Limped through the winter of 09/10, died after the 10/11 winter (UK).
Colour for your container garden which surprisingly also survives in the ground with protection.
The Queensland bottle tree. Slow and not terribly exciting.