Organic solution
How can I improve soil in a dry shady spot? Any plant suggestions?
Dry soil can be improved by adding organic matter – either as a mulch or by digging it in. Because the soil is dry and well-drained, any organic matter will be rapidly decomposed, so you’ll have to add the organic matter regularly for any long-term effect. So, try to locate a good annual supply of well-rotted farmyard (strawy) manure, garden compost and/or leafmould. Most tough evergreens, including viburnums, berberis and vincas, will thrive in dry shade. It’s important that any plants are well watered in the first season until established. Other plants worth trying are epimediums, lamiums, mahonia, pachysandra and small bulbs such as snowdrops, cyclamen and daffodils.