Anemones hupehensis (Japanese anemones) are fall bloomers. Sedum “Autumn Joy” which will stand some shade Is delightful and long-lasting in the fall. Another fall flower is aconitum (Monkshood). Lobelia cardinalis has brilliant red flowers but is relatively short-lived. Its blooms should not be picked but if the plant is happy it will self sow. It likes moisture and light shade. Another spectacular plant is the Iris kaempferi (Japanese Iris). It thrives in acid soil and loves wet feet. Monarda (beebalm) takes light shade, is an early summer bloomer and attracts hummingbirds as does Lobelia cardinalis. Aquilegia canadensis (Canadian columbine), Astilbe Primula (primrose), and Heuchera (coral bells) all do well in shade as do Cimicifuga (Snakeroot), Chelone (turtlehead), Dicentra spectabilis (large bleeding heart), Dicentra eximia which is smaller but blooms off and on all summer, and Tiarella cordifolia (foam flower). Arisaema triphyllum (jack in the pulpit) has an interesting bloom but its main attraction is a stalk of flaming red berries in the fail. It will grow in medium to dense shade. Begonia Grandis is a shade-loving begonia that is a perennial.
As for ground covers and edgings, there are many. Ajuga (bugleweed), Ceratostigma (leadwort) a fall bloomer, Convallaria (lily of the valley) Epimedium – a delight as an edging, Hedera helix (English ivy), Pachysandra where all else fails is well behaved, Liriope muscari (lily turf) and Asperula odorata (sweet woodruff) all do well. Phlox divaricata (Woodland phlox) although rabbit’s favorite food, is lovely in the spring.
The ubiquitous Impatiens with its many colors is the best annuals for shade. It self-sows frequently, is colorful, and doesn’t require care. Begonia semperflorous (wax begonia) is not quite as colorful but also may be ignored. Coleus is a reliable, primarily a foliage plant, but its foliage comes in many color combinations. The above trees, shrubs, and flowers are only a partial sampling of plant materials useful in shade gardens and represent some of the ones I have in our garden and find desirable.
Mulching is the greatest favor one can give a garden. Mulch makes for more consistent temperatures. It preserves moisture and coolness in the summer and helps prevent weeds. Adding more mulch once there is a heavy freeze helps offset the alternating freezing and thawing that can occur in our winters. In early spring, the mulch can be worked into the soil loosening and enriching it. Once summer starts, a layer of mulch should be added and the procedure started anew. Christmas trees cut up and placed over perennials protect them over the winter as do fallen leaves. However, both evergreen branches and dead leaves should be removed gradually in March as insects and diseases may thrive beneath them.
HAPPY GARDENING!