Answer: The plant that jumps to mind for this is the climbing hydrangea or Hydrangea anomala subsp. petiolaris. It needs a rich, well drained but moist soil (meaning not soggy)and is self clinging. As a result, it can be trained in the shape of a traditional espalier and looks lovely against a brick wall; the blooms are white and the foliage is a clean pleasant green. The main drawback is that it grows very slowly for the first two or three years until it becomes established.
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