....on the other hand I took a plant to the Languedoc in France where it has managed to survive the long dry summer and cold winter and has flowered this year, but in a mini form - about 12 inches high! The height of your plants could be the result of sufficient shade and sufficient moisture! It's not very keen on being transplanted as it has thick taproots, but removing the young selfseeded plants shouln't be a problem.
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In the sticks near Peterborough
....on the other hand I took a plant to the Languedoc in France where it has managed to survive the long dry summer and cold winter and has flowered this year, but in a mini form - about 12 inches high! The height of your plants could be the result of sufficient shade and sufficient moisture! It's not very keen on being transplanted as it has thick taproots, but removing the young selfseeded plants shouln't be a problem.