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Centaurea cyanus OSC Special Mixture Bachelor Buttons Seeds Robust 60 cm (2′) high plants are filled with double flowers in a wide array of clear bright colours. Uniform, bushy plants make this variety a real dandy! It is best to sow seed directly into the garden 2 weeks before your typical last frost date. How To Grow It is best to sow seed directly outdoors from mid-April to mid-May, lightly cover and keep evenly moist during the 7-10 day germination period. Thin plants to 20 cm (8″) in the garden. Be advised that this variety does not transplant well. Annual. Approx. 250 seeds/pkt.