Hi We've recently moved into a new house and I'd be very grateful if someone could help me identify this plant which has appeared in our garden and has taken over our veg plot. It has also appeared in the flower boarders in several places. It looks like it has been planted in the veg plot by the previous owner of the property and started out growing similar to potatoes, it has become very prolific and has masses of 5 pointed blue flowers, all the stems of the plant are covered in very sharp fine stinging hairs which penetrate my gardening gloves.