Perennial 45 cm. Greek oregano seeds offer the best, strongest flavoured oregano leaves for cooking. Plants are very hardy when established and impart a wonderful wild mountain aroma in the garden with their tiny white or pink flowers. Bees adore oregano when it is in bloom. Germination may be slow, so be patient. Oregano is one of the best herbs for drying because it maintains a strong flavour for months after harvest.