It is not economic to thin spinach. However, too high a density may increase problems with leaf diseases. Spinach which is harvested for pre-packs may be planted more densely. Irrigation Spinach must be kept well-watered, but the crop will not tolerate wet conditions. There are no herbicides registered for use on spinach.
Weed control is by hand.
Fertilisers Spinach has a high demand for nutrients. Molybdeunm 2 kg sodium molybdate Poultry manure is an excellent source of organic matter and can be applied at 30 cubic metres per hectare, three days before sowing on established vegetable ground. This will add organic matter to the soil and supply nutrients for the first three weeks. Spinach has a high demand for nitrogen and potassium. Diseases and pests Spinach is not seriously affected by diseases or insect pests.