This grower is sure of this plant identification.
I've had this fothergilla major for 3 years. It's healthy but just doesn't seem happy with me. It didn't like it on the shaded balcony in Barnes, and it doesn't like it here in St. Margarets on the windy balcony either. It doesn't like being potted, or perhaps I don't show it enough love. It's just not really growing as much as you'd expect. I think it would prefer being planted in a garden where it can really poot down root and achieve its full potential.
Fothergilla major (Witch alder). This shrub thrives in cool, shady mountain areas. Grows to 3m tall and a spread of 2m. Bears fragrant, white-green ball-shaped flowers appear in spring and again in autumn. The dark green leaves, slightly blue beneath turn yellow in autumn. The best known of the genus.
They are fully hardy and will grow in the sun or semi-shade but will colour best in full sun. They will need moist, peaty, acidic soil.
Hedging, specimen. Spring interest and attractive foliage in autumn.