Homegrown greens are not only a healthy addition to your garden, but are easy to grow. Spinach is high in vitamins A, C, K and folate. It also contains manganese, potassium, iron and phytonutrients. In the garden, spinach is a hardy plant that can be planted successively from spring to late fall. It can survive temperatures as low as 20 F degrees. Add spinach to your greens garden for a vitamin packed punch.