Spinach, with buttery nutritious leaves and cold hardiness, will never go out of style. It prefers late summer weather as it changes into fall, when days gradually become shorter and the sun rises lower in the sky. Spring plantings are best for baby leaf production as the plants tend to bold quickly with lengthening, hotter days. For best results in spring, over-winter small fall planted spinach plants. They will begin to grow again in late winter and early spring for a tasty harvest. Nutrients: vitamins A, E, K, and C, calcium, iron, magnesium, and potassium.