What is this plant?

in Plants
For a couple of years I've had this plant. It flowers in the springtime with little purple flowers.
It has seed pods. The plant has grown to 4ft. In the spring I shaked the dried pods over the ground. I now have lots of them. Some 8/9 inch high so far. I've potted lots of them in pots as moving and spaced out the remaining in the beds.
The big plant got a little wild and out of control hence I'd like to know what it is so I can care for it properly.
Many thanks in advance.
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I think what you have there is a perennial wallflower. No doubt someone will correct me if I'm wrong and give you the scientific name.
or maybe one of the stocks
In the sticks near Peterborough
Thank you so much. Its a hoary stock (Matthiola incana) by the looks of it. Thanks for the lead.