I may actually have TWO of these plants. Last Autumn when I was pruning the shrub I found a tiny seedling at its base, and potted it up.
Circumstantial evidence suggests that this is a self-seeded "child" of the first one, but I won't know for sure until it flowers. I grew the little plant indoors over the Winter and then planted it out in the border, where it has grown enthusiastically, but hasn't yet flowered. Hopefully it will do so next year.
The original plant (which I bought via mail order from the Duchy of Cornwall Nursery) was probably a two-year-old plant when I got it:
When I planted it out in Spring 2011 it was a compact, tidy plant...
In its first year it grew a lot, and produced a modest number of flowers. In the Autumn I pruned it hard, and it grew back vigorously this Spring, putting up lots of long whippy stems.
Unfortunately, as these stems got bigger and became covered in a mass of vibrantly reddish-purple flowers, the plant got top-heavy and gradually flopped over.
This past weekend I pruned the shrub again. This time I have made a special effort to prune back to vertical-growing shoots, which may help to re-balance it.
I have also used some of the prunings as cuttings, pushing them into the soil at the base of the parent plant, round at the back. Maybe next year I will have a whole clump of Buddleia bushes!