Spinach Growing Information Spinacia oleracea Direct Seed: As soon as soil can be worked until 6 weeks before first frost. Can be sown in tunnel or greenhouse to extend the season. Soil temperature for germination is 45-75° F, with best germination in cool soil. Spacing: 2-4" apart in rows that are 12-18" apart for bunching. ½” apart in rows that are 4-8" apart or in 2-4" bands for baby leaf production, at ½" depth. Growth needs: Grows best in fertile soil with good moisture. Make sure to choose the appropriate variety for your desired growing period. Harvest: Harvest when leaves are of desired size for bunching or baby leaf. Plants generally do not hold well in the field. Storage: Store in cooler at 36° F at 95% relative humidity for up to two weeks.