What to plant under this large maple/ large boarder

Help - I have a boarder which is about 5 ft deep and 7ft long and just can't achieve much of a lovely display in the boarder. It gets sun most of the morning but late afternoon just the edges.I think the position is around North / east. Last year I planted lots of lupins and foxgloves which didnt achieve much. I had hoped to put a good few large hydrangeas Annabel's to the back but will the trees take too much moisture? Any advice welcome as leaves a really void in the garden:( advices really welcome thank you
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You could try euphorbias which don't mind poor dry soil - but have nasty sap if it gets on your skin - and woodland glade plants such as early spring bulbs like wood anemone and also hardy cyclamen. Some of the hardy geraniums like renardii, Kashmir White and Ann Folkard should be fine and they would give you good foliage as well as flowers.
"We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw
There is a beech woodland near our former home in Belgium whose floor was always carpeted with teeny daffs in spring, before the canopy leafed up, so think about planting some of those too next autumn.
"We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw
Maybe start the foxgloves off in seed tray > pots > border, and work on improving the soil in the mean time.
"We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw