I have an area in my back yard that has several special requirements and I hope someone might have some shrub ideas for me on this...I will also need ground prep and maintainence ideas too.

The area is the corner of my backyard, sided by two 6'ft privacy stockade fences...next to a huge, black walnut, presumably over numerous other large tress root systems, such as a maple, chestnut and another that I have not identified.

The area seems to be moist and is deeply shaded. The only sun it gets is in the winter around noon and then regular reflected light.

What can I put there? Here's what I hope for:

-3 season interest

-greater than 3' tall

-3' wide or wider

-shade tolerant

-black walnut tolerant

-rapid/moderate growth

-hardy in Z5

-full looking

-prunable to approximately 5'

Here are some of my considerations:

Pieris (doesn't seem to be black walnut tolerant)

Kerria (not quite as full as I would like)

Viburnum (can't find a variety locally that is BW tolerant)

Cinnamon Fern (can't find locally, not quite tall enough)

Are their other fern varieties that would be giant and BW tolerant?

Help is appreicated!