If limestone is recommended as a result of a soil test, incorporate the lime into the planting area at least three months prior to planting. Proper watering and the use of calcium nitrate as a sidedressing discourages blackheart and tipburn, calcium deficiency disorders. The garden should be watered in the morning so that the foliage is dry before dark. Water the garden sufficiently to moisten the soil to a depth of 6 inches. Light sprinklings will encourage shallow rooting of the plants.
Spinach requires a uniform supply of moisture to produce a high-quality crop.
Do not cultivate deeply because this will damage roots. Do not move soil toward the plants because spinach leaves that are covered by soil will rot rapidly. Harvest dark green, tender leaves that are 3 to 6 inches long by picking individual leaves or cutting leaves. Start by picking the outer leaves and harvest the newer leaves as they reach the desired size. Rinse the spinach by using paper towels or a salad spinner.