Posted: 23/11/2012 at 17:01
Thanks Jo4eyes for you substantial answer. Point taken about pH - we are on the chalky side here. She wanted a shrub to fill the gap so I suspect a good hole with plenty of compost/food, regularly topped up will help. We could try heucheras and begenias, lamium/ivy/vinca and trachystemon beneath. Will get to it. Many thanks.
Thanks Obelix - does anyone know if sycamores exude toxins?