snip interesting info.
There's a fair number of cultivated seed strains. Chater's Double, in
single colours or formula mixtures, is the common double form.
Blackcurrant Whirl and Creme de Cassis have multi-coloured petals. IIRC,

Thank you for that Stewart, I have just been looking at the pictures on
your gallery and I can see that I have a great deal to learn :-) I was
given some Blackcurrant Whirl seeds but the flowers were not multi-
coloured, I was a tad disapointed but I suppose that there are bound to
be some failures, fascinating subject.
kate