Answer: 'Chicagoland Green' and 'Green Velvet' boxwoods do well here in Green Bay Wisconsin (z5a) in deep shade. Leatherwood (if you can find it) is one of the most shade tolerant. The Fargesia bamboos love the shade and do well here with winter protection. I also like Sambucus 'Pulverulenta' with its white-spoted leaves. Hydrangea arborescens is also very shade tolerant.
Hope one of these suggestions is just right for your garden!
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