We also have these beautiful specimens in South Africa. I never know the exact name. I just call it my giant spinach or monster chard. It used to come up like a weed all over the place year after year. But we have a drought now so water is not as liberally throw at the veggies (we usually put grey water on a few select gardens). Since then we've had no spinach. I either put those stalks through the juicer with carrots or feed it to my goats. They love their veggie treats