20 Seeds. As the name suggests it grows up to 3m. Also grown for its enormous daisy like flower. It is an annual. Sow under glass March to April. Outdoors April to June for flowers July-September. Prefers full sun. Spread 41-50cm. Attracts butterflies and bees. Sow thinly into finely raked and watered soil. Half inch deep. Thin to 12 -18 inches. Support as they develop. Easy to grow.