Spinach is a cool-weather vegetable. A fast-growing plant, it yields many leaves in a short time in the mild weather of spring and fall. The trick lies in making spinach last as long as possible, especially in the spring, when lengthening days shorten its life. Although it prefers full sun, spinach is one of the few vegetables that produce a respectable harvest in partial shade.
Kale is a biennial. Companion plants: beets, celery, lettuce, onions, potatoes & strawberries. These companions spread & provide shade for the soil, helping to keep the soil cool. Kale likes cool soil. Also apply a heavy mulch like shredded leaves. Feed monthly with fish emulsion or compost tea.