The first planting can be made as soon as the soil is prepared in the spring. If the soil was prepared in the fall, seeds can be broadcast over frozen ground or snow cover in late winter and they will germinate as the soil thaws.
Plant successive crops for several weeks after the initial sowing to keep the harvest going until hot weather. Seed spinach again in late summer for fall and early winter harvest. Chill seeds for summer or fall plantings in the refrigerator for 1 or 2 weeks before planting. Sow 12 to 15 seeds per foot of row.
Cover 1/2 inch deep. When the plants are one inch tall, thin to 2 to 4 inches apart. Closer spacing (no thinning) is satisfactory when the entire plants are to be harvested. The rows may be as close as 12 inches apart, depending upon the method used for keeping weeds down. In beds, plants may be thinned to stand 4 to 6 inches apart in all directions. Little cultivation is necessary.
The plants may be harvested whenever the leaves are large enough to use (a rosette of at least five or six leaves). Late thinnings may be harvested as whole plants and eaten. Cut the plants at or just below the soil surface. Spinach is of best quality if cut while young. Two or three separate seedings of short rows can provide harvest over an extended period.
(Approximately 1,800 - 3,800 seeds per oz.)