Growers may purchase well-graded, 1-year-old crowns from reliable sources or nurserymen, or grow their own crowns from seed provided irrigation is available. Seed should be sown in the late spring in well-prepared fertile soil which is around 21°C at depth of seeding. Seed 2.5 to 4 cm deep and 10 to 12.5 cm apart in rows 60 to 90 cm apart. About 5.5 kg of seed will be sufficient to sow a hectare of nursery (2.2 kg of seed per acre) and each kg of seed will produce 22,000 usable crowns.