Posted: 20/07/2013 at 05:35
I would tend to agree with Bob. Anything grown on a rootstock can get anomolies sprouting from below.
I have on occasions had what I believe are called "sports" coming out of variagated plants. These are reversions to the species from the variety and should be pruned out or they tend to take over the plant.
I did see a lovely cotinus at the garden centre the other day called lady something which I've never seen before and is a lovely olive green colour.