Dwarf Buddleias

[Fireweed]

OK, I know buddleias crop up here regularly (groan!).

Has anyone tried dwarf buddleias, particularly the "Buzz" type?

If anyone grows a dwarf in a container, what size container would you recommend?

We already have a (regular size) Buddleia "White Bouquet" in a large container that has done well for a few years now. We'd like to add one or two dwarf (in container/s) in a different colour.

[nightshade]

I don't know these what is the height and spread?
I have always liked the Buddleia alternifolia

[Fireweed]

I don't know these what is the height and spread?

"Buzz" buddleias are said to be 120cm height and spread (perhaps a bit smaller if grown in a container).

[Ygdrasil]

I have an "Ellens Blue" Buddleia in my garden, its supposed to reach a height of 150cm thats about half the size of a traditional Buddleia.
Its got the most blue flowers of any buddleia.
Last summer it was around 120cm high.