Leek HILARI 350 SEEDS £1.80 Quantity: at £1.80 each Add To Basket Medium dark leaves and long stems. A leek for harvest in late summer, autumn and early winter. 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: 350 seeds.