(C. elata x C. flexuosa) The first of these hybrids this is a good tough plant. More or less evergreen, fresh green foliage produces upright stems topped with big heads of bright blue, scented flowers in mid-late spring. 50cm. Good soil in shade.
A very pretty Jacob's Ladder with branched stems of scented, sky blue flowers in late spring and summer to 45cm. Sterile so no seeding to worry about. Ordinary soil in sun.
Upright spires of blue flowers to 1.2m from midsummer into autumn on this delightful selection of the north American native. Average to good soil in sun. This form close to the usual wild type.