SOWING: Spinach grows in a wide range of soils but should have a pH between 6.5-7.5. Spinach germinates best in cool soil between 50-60°F. Begin sowing in early spring as soon as the ground can be worked. Summer sowing with higher soil temperatures will lead to low germination. Do not use a heat mat to germinate. If sowing has to be done during warmer weather, irrigating can help cool the soil and improve germination. Sow in mid to late summer for a fall harvest. Spinach can also be planted from late summer until freeze-up in protected structures for fall, winter, and spring harvest. Using floating row covers offers additional winter protection.
PLANTING AND HARVEST: For baby leaf: Sow in a 1/2″ apart, 2-3″ bands, 1/2″ deep, about 40 seeds/ft. Clip small leaves in 3-5 weeks, depending on time of year and speed of growth. For a continuous supply, sow every 7 days. For bunching and full size: Sow 10 seeds/ft., 1/2″ deep, rows 12-18″ apart. Harvest spinach full size but before bolting, cutting just below root attachment for “rooted spinach”, or cut higher for “clipped spinach”.
AVG. DIRECT SEEDING RATE: For full-size leaves: 10M/1,000′, 290M/acre at 10 seeds/ft. in rows 12-18″ apart. For baby leaf: 1M/25′, 25M/125′, 1,200M/acre at 40 seeds/ft. in rows 18″ apart.