First thing that I would need to know is what part of the country are you in? If I know that then I can figure fairly closely what Zone you are in. Second I would like to know what exposure, N/S/E/W. Third, how dense is the shade?Forth, what type of trees are there, deciduous or evergreen, pine trees? Effective base information leads to effective answers :)(I'm referring to your post up above!) My qualifications on this subject: Degree in Environmental Horticulture, 4 years landscape designer (among other things). For what it's worth, I think this board is wonderful and there are many regulars that we should be thankful they are here.