Buddleia alternifolia var. 'Argentea' in the Upper Garden is elegant and graceful. This butterfly bush can get up to 12 feet tall. I usually prune a third of the plant to the ground each year which helps keep it in scale of the garden at about 5-6 feet. The lavender flowers boom in late spring each year on pendulous branches. The silver foliage is an effective foil for the garden in the summer and fall.