Achillea ptarmika 'Double Diamond'
Brilliant white pom-pom shaped flowers that come and come again. It ony grows to around 50cm tall and is a clump growing perennial. This really is a lovely herbaceous plant, very hardy and it is such a rewarding plant. ptarmika spreads quite quickly so you can fill the space in you design well and will be one of the best herbaceous plants in the garden.