Chinese Elm

The Ulmus parvifolia, or Chinese Elm, is among the most forgiving shade trees in cultivation. It takes compacted, alkaline and impoverished urban soil, tolerates heat and drought once established, and carries a rounded crown of fine arching branches clothed in small leathery leaves that colour yellow and russet before falling.
The bark is the second reason to plant it: as the tree matures the outer layer flakes away in irregular plates, leaving a mottled patchwork of grey, green, orange and brown that reads all year and particularly well in winter.
The Chinese Elm is the tree to specify where the soil is poor, the site is hard and the scheme still needs a proper canopy.