Posted: 27/01/2014 at 14:42
Thanks for the warnings about the Hypericum. The red autumn colour is very attractive, as are the black seedheads, but I will certainly keep an eye out for rampant seedlings. I have a couple of clumps which haven't spread as yet, but I did (experimentally) dig around the edge of one in the summer and decided it had very strong roots.
Hopefully, H. androsaemum is one of the "tamer" varieties.