At harvest time Sweetcorn Early Xtra Sweet is twice as sweet as other varieties. Instead of the sweetness and flavour deteriorating as in other sweet normal varieties, Sweetcorn Early Xtra Sweet has a rich sugary flavour and is easy to grow. To ensure maximum sweetness do not grow near ordinary varieties.Sow seeds mid spring. Requires a fertile soil in a sunny position. Germinate at 20-30C (68-86F) on the surface of a good free draining, damp seed compost in 7.5cm (3in) pots. Apply a layer of compost or vermiculite, 1cm (½in) deep. Place in a propagator or seal container inside a polythene bag until after germination which usually takes 6-10 days.Plant out after all risk of frost 45cm (18in) apart in blocks to aid pollination.Once the cobs start to form. water regularly. Cobs are ripe when the liquid of the grains is thin and creamy.