Ask Mr. Smarty Plants

For most grasses, shade tends to be a problem.   There are several grasses that will do well with salt tolerance, but not with shade tolerance [e.g., Distichlis spicata (Saltgrass)].  However, I have compiled a list of several grasses, forbs and small shrubs that are reported to be salt tolerant and will grow in partial shade using the following sources:

• Connecticut Coastal Planting Guide from Connecticut Sea Grant, University of Connecticut
  

• Teaching Marsh:  Salt-tolerant Native Plants for Tidal Shoreline Banks & Slopes from Virginia Center for Coast Resources Management

• Plants for Atlantic Coastal Restoration from USDA Natural Resources Conservation Service (NRCS)

• Storm Clean-Up 101:  Salt-Tolerant Plants from The New York Botanical Garden

• Relative Salt Tolerance of Coastal Species from USDA Natural Resources Conservation Service (NRCS)

GRASS/GRASS-LIKE:

Spartina patens (Marsh-hay cord grass)  Here is more information from Plant Fact Sheet from USDA NRCS.

Panicum virgatum (Switchgrass) will grow in part shade.   Here is a Plant Fact Sheet from USDA NRCS.

Andropogon gerardii (Big bluestem) will grow in part shade and is moderately salt tolerant.

FORBS:

Limonium carolinianum (Carolina sealavender) grows in part shade.  Here are more photos and information from Go Botany.

Symphyotrichum tenuifolium (Perennial saltmarsh aster) will grow in part shade.  Here are photos and more information from Connecticut Wildflowers.

SHRUBS:

Baccharis halimifolia (Groundseltree) grows in part shade from 5 to 12 feet.  Here is more information from North Carolina State University.

Arctostaphylos uva-ursi (Kinnikinnick) is evergreen and is low-growing in sun or part shade.  Here is more information from University of Connecticut-Horticulture.

Morella pensylvanica [synonym=Myrica pensylvanica] (Northern bayberry) is a shrub of 3 to 12 feet that grows in part shade.  Here is more information from the University of Florida.

Rosa carolina (Carolina rose) grows in part shade to 1 to 3 feet high.

I don't know exactly how much shade you have, but I think your main problem is finding plants that will grow in full shade that are also salt tolerant.  Additionally, the tidal range of 3 feet may be a serious problem with some of these plants.  The Relative Salt Tolerance of Coastal Species list may help you determine exactly which species will do best.   You can check the light requirements for various plants on any of the lists by searching (using the scientific name) in our Native Plant Database.

Best of luck!