Direct sow spinach outdoors from March to August in well prepared, fertile, moist soil in sun or semi shade. Early spring and late autumn sowings can also be made under cloches or in the border soil of a cold greenhouse. Sow seeds thinly at a depth of 1cm (1/2") in drills 30cm (12") apart in soil which has been raked to a fine tilth. When large enough to handle, thin out seedlings to 5cm (2") apart. The thinning are ideal for adding to salads. Sow every 3 to 4 weeks for a continual supply of spinach leaves throughout summer and autumn.
Water spinach regularly as dry conditions may cause spinach plants to bolt. Hoe between rows to prevent weeds from establishing. A thick mulch applied around the plants will help to retain moisture in the soil. Harvest spinach leaves when required by picking a few leaves from each plant. Regular harvesting will promote a constant supply of fresh young growth. Alternatively pull up whole, mature plants.