I have a Lobelia cardinalis 'Queen Victoria' which is coming into it's third or fourth year, It is four individual plantlets in a little clump. Should I split them or leave well alone?
You can divide them in early spring or take cuttings in mid summer. I consider early spring to be March, so you should just about be OK. However, I'd try cuttings this year and divide next spring as the clump doesn't sound that large at the moment.
Thanks Bob, will do