Wild Flower - Dyer's Woad - Isatis Tinctoria
This variety features long bluish-green leaves grow around each tall flower spike. The top of each stalk produces many yellow flowers which turn into large, flat, blue-black, decorative seed heads. It flowers in June, and grows to a height of 130cm.
This wild flower requires a rich, well-drained soil in full sun. It is a biennial or short-lived perennial, and will not grow well in the same soil for more than two years. Sow in spring or late summer in shallow drills, covering the seed lightly with soil and watering well. It can be sown in trays and transplanted when large enough to handle.