We had one of these probably over 30 years old and that regularly flowered and grew new stems, to the extent that the overall plant was probably in excess of 15-20 mature stems and several new ones every year!
Regrettably we have had to remove it as we now have 6 grandchildren aged from 6 months to 10 years that visit us and play in the garden – the spikes on this plant can be dangerous to small children.
Having dug up what we thought was everything and re-seeded with grass we now have numerous shoots continuing to grow through the lawn.
Whilst not itself a problem, is there any way we can rid ourselves of these short of digging down several metres again?
This article will help you.