Sow the spinach seeds thinly in rows spaced about one to 1 1/2 feet apart or simply scatter the seeds in blocks. Cover lightly with soil, firm in place and water well. Keep the soil moist until germination. Once the plants have a grown their true leaves, you can begin to thin the plants to about six inches apart.
If the weather isn't extremely cold, seeds will germinate in five to nine days. Spinach produces beautifully in cool fall conditions, but it's tricky to persuade the seed to germinate in the hot conditions of late summer.
While sowing seeds make sure the soil is damp and not wet. Water the seeds as the soil starts to dry. It should always be moist, but never wet or muddy. Do not water the seeds if the soil is already moist to the touch, as overwatering your plant can be just as harmful as underwatering.
Keep the seedling tray in bright filtered light to begin with. Slowly introduce the plant to morning sun and bring it back in before the afternoon sun sets in. In a weeks time you can put it in direct sunlight.