Carrot AMSTERDAM FORCING 1000 seeds £1.70 Quantity: at £1.70 each Add To Basket Early maturing carrot with long narrow roots. Ideal for early and late season production under fleece or inside in tunnels or greenhouse. Sowing instructions: Sow seeds from January until middle of May or from September to November. Sow in rows 20-25 cm apart, 6-13 mm deep. Try to space the seeds 1 cm apart. Growing instructions: Keep well weeded and avoid thinning late as this encourages carrot root fly attack.