Answer: Even shade tolerant plants usually need a bit of direct sun or bright reflected light to grow and bloom well. Aucuba however is one of the most shade tolerant plants I know, so that could be a good choice for a deeply shaded location. Hostas (many cultivars in a variety of sizes, shapes, colors and textures), ferns, and English ivy (Hedera helix) are also very shade tolerant as are Pachysandra, Asarum, Pulmonaria, Solomon's Seal, Ophiopogon, Liriope, and Lily of the Valley. Keep in mind that these will naturally grow very slowly due to the lack of light and may not bloom as well as they would in a brighter location. Your local county extension and/or professional nursery staff may also have some suggestions based on a more detailed understanding of the growing conditions at the planting site and your overall design goals. The plants I have listed in my experience will grow in truly deep shade. Here is a discussion of varying types of shade you may find useful in evaluating the site. You may need to cut and paste the complete url into your browser to make it work correctly.
I hope this helps you get started with your planning.
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