syn. 'White Rain'. The beautiful white flowered form of this front of the border favourite produces masses of it's whorled flower stems all summer to 40cm. Cut back if needed. Drained soil in sun. Easy and hardy.
A very pretty form with denim blue flowers in big purple bracted spikes giving a good show long after each flower has fallen. Makes a fairly big clump in time to 30cm high. Ordinary soil in sun.