Plants for under 100 year old maple tree
I'm trying to find something to plant in the back corner of my small yard. On the other side of my fence is a 100 year old beautiful (but messy) maple tree.
The corner currently has a small Japanese painted fern which is growing slowing but seems to be quite happy and lamium which I want to take out since it looks terrible against the fern. I noticed today that my neighbour's tiger lilies have escaped and growing in the corner too.
My garden is entirely cool colours - pinks, purples, whites so I don't really want to include yellow, oranges or reds.
The other issue is because of the roots to the tree I can barely get into the ground - if I can get down 2" I'm lucky.
What can I plant that would grow well in that corner? It is definitely dry shade but also well protected.