Spinach (Spinacia oleracea) is a member of the Chenopodium family. It is a cool-season crop that is profitable for growers and only takes 40 days to mature. Spinach is a heavy nitrogen feeder. This is also one of the most labour intensive of crops. Talking with a local farm worker, he noted that a frost that killed Swiss Chard out in the field did not hurt the Spinach.

Several online sources have nutritional information:
Spinach is a great source of vitamin A, vitamin C, vitamin K, riboflavin and vitamin B6, vitamin E, calcium, potassium, dietary fiber, magnesium, manganese, folate and iron .. also contains oxalate inhibits iron absorption

Below is what the Healthy Edibles database by Chris Dixon says about this in demand nutrient dense vegetable: (For Education Only)

aids strong nails, hair shine, healthy youthful skin (also keeps lips from chapping), teeth, bones, heart health, joits, ligaments, tendons, cartilage, eye cornea, spine discis, digestion and lung tissue, blood circulation (a remedy for enlarged veins), as well as fertility, as reduces oxidative damage to egg and sperm, aids mental health, as is anti-depression, reduces anxiety and mood swings from PMS (pre-menstrual symptoms). Reduces the appearance of dark under eyes caused by poor blood flow. It is a liver cleanser, lwers blood pressure, boosts immunity and decreases body inflamation. Helps prevent macular degeneration of the eyes, aged-related vision loss, night time muscle leg cramping, kidney stones, anemia, some cancers, COPD (Chronic Obstructive Pulmonary Disease of the lungs), premature aging, some hearing losses, irregular heart beat and type2 diabetes. Reduces bloating, swelling/water retention in feet, legs, hands and breasts.protects against risk of Alzeimer’s disease, osteoporosis (fragile bones) and bone fractures, as well as osteoarthritis pain, etc. symptoms in later life. NOTE: New Zealand spinach is not really a spinach. Caution: Spinach contains high amounts of oxalic acid that limits the amount of calcium the body can absorb, but this can be countered by eating foods high in vitamin C like fresh tomatoes (not canned) or fresh citrus fruits like oranges and grapefruits.

Canadians eat around 1.4 pounds of Spinach a year. Compare that to Lettuce, where they eat 22 pounds each year!