blight-resistantrare Potato Alternativehappy In Poor Soilstry Growing This Rare and Highly Nutritious Gourmet Vegetable Which Is Attracting More & More Attention From Gardeners & Home-growers. & Its Easy To See Why.known As new Zealand Yam oca forms Underground Tubers like A Potato Plant but they Are Smaller, Crunchier & Really Satisfying.oca gives You Lots Of Edible Underground Yams which Can Be Eaten Cooked Or Raw, When Raw It Has A Lemony Flavour, Becoming Nuttier Once Cooked.ocas are Not So Hungry Like Potatoes So Fare Well if Your Plot Is Made Up Of shallow & Poor Soil.we Recommend You Harvest Approx. Three Weeks After The First Frost Has Killed The plant Canopy in Late November or December.