Latin would help here, are we talking Oxalis or Rumex?
Assuming we're talking Rumex acetosa (Garden Sorrel), in which case part shade can work fine, but not full shade, in my experience. I don't have as much experience with Rumex scatatus (French Sorrel), but I'd imagine it's similar.
My lady makes a Cream of Sorrel soup that is absolutely one of the finest soups I've ever had. So tangy and delicious. I'm growing it myself just for that soup.