"David wrote in message
Normally Bishop will be dark from the start
--

Strange. We have a number of Dahlias and have had for years but this year is
the first time we have the Bishop ( thought I had better join the club) and
much to my surprise the leaves aren't especially dark. Indeed no darker than
some others we have that are green leaved.
Perhaps it's because it's still in the greenhouse and it will darken when
planted outside.

--
Bob

www.pooleygreengrowers.org.uk/ about an Allotment site in
Runnymede fighting for it's existence.