If you enjoy growing the trocial plant I.Canna under it's many types,names,size, then you might enjoy the oldest e-mail list canna-net. It's been online since 1993. At this time it's on a spam free UK list server, not yahellgroups.
If you would like to give it a try just send a blank email to: snipped-for-privacy@domeus.co.uk
and besure to answer the return message.