Avon, United Kingdom

I have this plant in my front garden, I dont know the name of it and I bought it 9 years ago.
I planted it in a large pot and it looked great when I moved house I thought it needed more room and planted it in the ground in my front garden. It has taken over and although the flowers are very pretty Its mostly leaves and has now grown sideways and taken over! Help I cant take it out because its roots have gone sideways too far,do I put weed killer on it? seems harse but has taken over...

• 12 Sep, 2010