I have a ravine hill beside the yard. Most wooded...but the area beside the waterfall is not.

I have a bird feeding patio not far from this area I wish to plant a shrub that in all honesty will most likely not get pruned once in due to the steepness of the hill. Figured to put rocks up against the rootball in a retaining wall sort of way to help hold the plant on the hill and the dirt not washing out from under it.

Up for consideration...

Winterberry: because of the berries it produces come winter. Think it would add some beautiful color as well as an additional food source for the birds.

Weeping butterfly bush: I have admired one since someone from town landscaped with it and I researched what it was.

Weigela: my husband is fond of the neighbors shrub.

Any reason that I should take one off my list or consider one over the other?