Buddleia globosa

How large are the flowers? I've just acquired one of these and the flowers seemed smaller. Does the bush grow very large?

I "hate" to tell you, Celandine, but ours is nearly 20 ft tall, and I have to hack it back every Spring, because it grows madly just like any Buddleia
Ours was there b4 we bought the house, and we've had several car paint repair jobs done, due to reversing out of the drive too close to this one! Also, it attracts loads of bees (as opposed to butterflies), and our children are a bit wary of it. in its defence, however - a lovely shrub (properly managed) (?)