If you're looking for a robust perennial ground cover that will even thrive in dry shade look no further than Trachystemon oriantale. Its mass of foliage does the weed smothering efficiently and its purple blue flowers are a treat in the spring sunshine. Its mass of roots also make it a great plant for holding together the soil on slopes.But why is its common name Abraham, Isaac and Joseph? I'd really like to know. If you've any idea, pleae post a comment. Thank you!