Leek BLUE GREEN WINTER/AVANO 400 SEEDS £1.70 Quantity: at £1.70 each Add To Basket Improved selection from Blue Green Winter with long shafts and erect dark green foliage. For autumn and winter harvest. Can stand heavy frosts. Sowing instructions: Sow seeds from February 6 mm deep in rows 40 cm apart, later thin to 15 cm between the plants, or raise plants in a seedbed or in modules. Growing instructions: Leeks grow best in a deep fertile soil. Plant the pencil thick plants out in June at 40x15 cm. Ridge up a few times when the plants are growing. Average contents: 400 seeds.