Parsnip WHITE GEM 650 SEEDS £1.70 Quantity: at £1.70 each Add To Basket Sweet and tender roots. Ideal for all soil types especially clay. Roots are medium long. Sowing instructions: Sow from March until mid May in rows 35 cm apart. Growing instructions: Thin later to 15 cm. The harvest can start in autumn but the taste improves after frost. Can stay in the soil during winter. Average contents:650 seeds.