White Valerian - Centranthus Ruber Albus
This plant grows well in dry conditions. It has green/grey foliage and white flowers from June onwards. It reaches the height of 70cm, and spreads to about 45cm. It can also be planted in dry stone walls.
Sow the seeds in the spring and place pot in a polythene bag. Germination will take between 3 and 4 weeks. They can also be sown direct from later Spring.