I've just bought a lovely euphorbia amygdaloides purpurea for my garden.
I have heard they can be quite invasive and dominate the ground and plants around them.
Is this true?
In that case would I be ok to plant it like i do mint? I.E. in a large pot with its base cut out buried in the ground -to stop it spreading?
Or is it a slow grower and easily controllable in the ground with a bit of effort?