Well done on finding a plant. I woud keep it in the pot for a while. I planted mine outside because I have nowhere else to put it for now, my greenhouse arrives on February 11th (big day!). Also the pigeons have not yet noticed Homeacres garden but when they do I am ready with netting, which it needs if they are hungry as it is so tasty.
But the plants are hardy and tolerate heavy soil, with some organic matter on the surface. Let it grow until about June then pick larger leaves and any shoots which snap off or blow off can be popped into a hole in the ground to make new plants.