Tall Cornflower Mixed Seed by Mr. Fothergill's. Double flowers, tall stems. So easy to grow, double flowers on tall stems. For borders and cutting. Attracts butterflies and bees. Height: 90 cm/36-inch Plant Class: Hardy Annual (HA) Habit: Tall Bushy. Useful Information: Partial shade; Suitable for attracting Bees; Suitable for attracting Butterflies; Suitable for cutting; Mr Fothergill's favourites; Perfect for Pollination Sow and Grow: Sow outdoors, March-May or August-October, where they are to flower, 0.5 cm (1/4-inch) deep, directly into finely-prepared, well-drained soil, which has already been watered. Seedlings usually appear in 14-28 days. Thin seedlings to 20 cm (8-inch) apart. Water well until plants are established. For a continuous display, make sowings at two to three-week intervals.