Well, I just think you have to grow some “Yerba Buena”. CLAY, SAND and SHADE TOLERANT, it also grows under oaks and makes a lush, flat, evergreen groundcover for shade, spreading to 6’ across and up to 2" tall. Fantastic used as a trailer, especially over a shady wall, you can even grow it in a hanging basket. It roots along the stems, not by rhizomes and is not invasive. The rich, green, scalloped leaves are held oppositely on the stems and little, flaring, tubular, white to purple flowers appear Summer thru Fall. Easy, tough and long lived, it smells heavenly and makes a healthful and tasty, mint-like tea. Used medicinally by native people for indigestion, insomnia, fevers, colds, arthritic pain and toothaches. Very pretty and deer resistant, too! It’s perfect in every way! Just give an annual bit of compost and cut back occasionally to promote bushiness. Drought tolerant, but best with some Summer water.