Vitis vinifera ‘Thompson Seedless’ USDA Hardiness Zone: 7 – 9 Watering Needs: Once established, needs only occasional deep watering. Vigorous deciduous vine with bold-textured, deep green foliage. Grown for its large bunches of small, sweet, mild-flavored, green grapes. Good mid-season table grape. Average Landscape Size: Fast-growing vine to 20 to 25 ft. each year.