I was given two Abutilons by my aunt who lives in Northern Ireland and has them in her garden. They were young plants and I planted them out into my garden in the spring. They have been growing very well and one of them is still doing well but the other has turned yellow and seems to be dying. It's now about 6ft tall. I now read they don't do well in gardens so am confused. I don't have a greenhouse. Can I dig up the dying one or should I leave well alone?