Answer: Plants that tolerate deep shade and will still flower include, hosta, bluebells (Mertensia), Solomon's Seal, and Bleeding heart. These are all perennials. Annuals include impatiens and begonias. Consult with your local nursery for more ideas. Removing spent blossoms from impatiens is not necessary. They put on quite a show with little or no care from you!! It's difficult to prescribe a cure for you salvia without having more information about its condition. It could just be transplant shock and will perk up after the roots have a chance to set. Pamper it, but don't overwater and it should recover!
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