Quality Spinach Seeds packaged neatly. Spinach is a leafy vegetable rich in water-soluble vitamins, fat-soluble vitamins, minerals, and a wide variety of phytonutrients, there are many different ways to incorporate spinach into your meal plan and enjoy a variety of nutritional benefits. Low in calories, and is a good source of vitamin C, vitamin A, and minerals, especially iron. It is best eaten fresh as it loses nutritional properties with each passing day. Trivia: Spinach is a native plant of Persia (modern day Iran). It was introduced to China in the 7th century.