Thanks everyone. I am hoping that as it is (allegedly) a perennial I can propagate it from cuttings in early spring or maybe by division - time will tell.
I was going to ask a similar question re Foxglove "Foxlight". I've got a couple in pots among several standard foxgloves. Plenty of bees seem very interested, so there must be something in it for them, but are "Foxlights" sterile.
Sterile plants, like geranium Rozanne, can provide plenty of nectar and pollen, it's just that that they cannot set seed. For this reason you don't need to deadhead and the plant will flower for a much longer season until the frost/cold/darkning days end the growing. It won't have a hormonal switch into think it has reproduced and its job for the seaon is over.
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Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.