DW who does most of the cooking, and I who does 50% of the eating like sorrel soup. She also adds it to meatloaf type dishes. It is a perennial, but sometimes you just need to replant new bed. It will grow in shade. It is not invasive at all. That is why I needed to baby it.

I container grew it this year for the sake of competition from my hens. It grew all summer and DW would pick the larger leaves and bag them in plastic baggies and freeze for later use. Some we used right away. The small leaves remaining would just keep growing and process kept going. It is possible to let plant mature and go to seed. Collect the seeds for next year.
It is a common food for people of Eastern Europe, and Israel. The seeds as well as the jars of canned sorrel come from those areas. I find the seeds at European Delis in the spring. (Chicago area) They seem to be the first seeds they run out of. (go fast, and maybe quantities ordered are small). Never seen them at other seed displays like at Walmart.
NFC, and LG, If you are interested in seeds, PM me and I will send some via US mail. Already have another person locally I will get some for. Seeds do not appear until about March.