On the Street . . . Yates Street, Denver, Colorado

Which came first, the Buddleia alternifolia 'Argentea' or the house's color palette?

Buddleia alternifolia 'Argentea', Silver Fountain butterfly bush

Regardless, it's a striking combination! Silver Fountain butterfly bush differs from the more common Buddleia  davidii in that it blooms on new wood in mid to late spring (no need to cut this shrub down each year). The slender, silvery leaves are a nice asset that make an attractive contrast with the foliage of the lilac shrub that it's paired with here.

Buddleia alternifolia 'Argentea', Silver Fountain butterfly bush

Left to its own devices, Silver Fountain butterfly bush will  grow up to 12'x12' in size ---- so give it plenty of room in a sunny spot with well drained soil. Hardy to 8,000 feet with low water requirements, once established.