A friend has just given me a couple of plants of warrigal greens. Also called New Zealand spinach. Botanical name Tetragonia tetragonioides. My friend tells me once it is established it grows like a weed with no water or care. She also tells me that to eat it you have to cook it for a 3 minutes to get rid of the oxalates so I am wondering if animals, particularly sheep and horses can safely graze it.