Do now days nunkingcherry and sandcherry need full sun all day.

I have gotten nunking cherries and Sandcherries the nursery I got them though told me they had to have sun all day. I have some older nunking cherries and they only recieve morning sun or until 1:00 pm. They have product every well for me. there might be 3 to4 plants in a clump and I get about 10 lbs. or more a years. I us them in wine because I have a winery. (good suff) Now the sandcherries I know nothink about? So help? Irvincellar