Sweet Potato Trio If you\'re a sweet potato lover and prefer to grow something different to the traditional spud, then why not try our delicious trio of sweet potato varieties! The Treasure Island Series comes from an innovative breeding programme producing sweet potato plants as ornamental edibles. The attractive foliage can be harvested as nutritious salad leaves until early autumn when the plants are lifted for their crop of delicious tubers. These compact plants look equally at home on the patio as they are in the vegetable plot, making superb foliage plants throughout the summer. Sweet potatoes are a versatile ingredient in the kitchen and can be used to make tasty homecooked fries and jacket potatoes with extra sweetness! Height and spread: 1.5m (59).