"Bob Williams" wrote ...
The blooming habit of these little beasties is a bit peculiar.
The blooms come in groups that last only a few days but they are
replaced by new groups at approximately 2 week (fortnight) intervals.
I like them but they can be pretty invasive. They will quietly take over
your garden if you let them.

I wish! Here they are a prized greenhouse plant. :-)

--
Regards
Bob Hobden