Rupert (W.Yorkshire) wrote:

I've had a search around and 'New White' claims to be pure white as does
(nearly?)Canna x generalis 'Alyse',Snow Dragon and Chesapeake.
Some appear to be "new" -so lets see what comes up.
Your original comment about weak flowers may be pertinent to this lot.

'Chesapeake' looks to be by far the most promising being the nearest to
a white, but it was only released this year. They're all US raised
hybrids by Karchesky and don't appear to have made it to the UK yet,
even though one or two were introduced a few years ago. How these can
perform in UK summers remains to be seen and for me that's the crux of
the matter. I asked someone over there (in San Francisco) about these
and he's just replied suggesting that 'New White' can be rather shy
flowering and needs a deal of warmth to produce its buds. He also
points out that someone mentioned it being very tall, although that
hasn't been his experience so far.