Hydrangea 'Dark Angel' Patio TreeHydrangea Dark Angel patio trees are deciduous outdoor plants with luscious, deep green leaves flushed with rich burgundy. In midsummer, the plant boasts plentiful large, showy blooms in shades of mauve pink with creamy, white centres. These hydrangea plants are fabulous for many areas of the garden and patio, including mixed borders and beds, pots and containers and they are also great for placing at gates and entryways, or as front door plants.