 | Purple Robe Locust Tree. Need a fast-growing, hard-wooded, easy-care, extremely ornamental native tree? We literally can't keep this tree in stock! The flowering Purple Robe Locust Tree (Robinia pseudoacacia 'Purple Robe') is an improvement of the native Black Locust tree! It's become incredibly popular because of its great purple flower color and excellent fragrance! But once established, tough Purple Robe Locust trees are also super hardy and drought tolerant with a brisk growth rate of 2 or 3 feet of growth each year!... - Purple Robe Locust Tree. |