One packet of seed will plant 25 feet of row. One ounce of seed will plant 100 feet of row. Commercial seeding rates are 12-15 pounds per acre. Spinach requires a soil pH of 6.0 - 6.5 and will not grow well if pH is below 6.0. If soil pH is too high, leaves may show a generalized yellowing or chlorosis.
Spinach is adapted to a range of soil types, from light and sandy to silty clay loams.
In heavier soils, spinach should be grown on raised beds to improve drainage for the shallow-rooted plants. Seedling damping off can be reduced by use of raised beds. After seeding, the soil should be kept uniformly moist. When irrigating the garden, apply water in the morning so that the foliage is dry before dark. Apply sufficient water to moisten the soil to a depth of six inches.