Canterbury Bells (Campanula medium)
Canterbury Bells were among the first imported flowers grown in colonial American gardens, where they were valued for their blue, bell-shaped flowers as well as for their edible roots. In 1812, Thomas Jefferson recorded sowing the "Bellflower" at Monticello; this may have been Canterbury Bells, a biennial, or one of the perennial Campanula species available at the time.
For more information & the possible availability
Contact The Tho Jefferson Center for Historic Plants or The Shop at Monticello