Little cultivation is necessary. Care Spinach grows best with ample moisture and a fertile, well-drained soil. Usually, no supplemental fertilizer is needed. If growth is slow or the plants are light green, sidedress with a nitrogen fertilizer containing sulfur. Cut the plant at, or just below, the soil surface.
Spinach is of best quality if cut while young.
Two or three separate seedings of short rows will provide harvest over an extended period. Some gardeners prefer to pick the outer leaves when they are 3 inches long and retain the younger leaves for later harvest. Harvest the entire crop when seedstalk formation begins in the spring. A. Spinach bolts quickly to seed during the long days in late spring or summer. Warm temperature accelerates this development.