Very few plants can adapt so well to various climates as venus looking glass. This perennial grows especially well in sandy soils and prefers areas where there is little competition. It can grow from six to eighteen inches in height, but its stems are so weak that it often grows prostrate. Leaves are alternate, broadly ovate and clasp the stem by a heart-shaped base. Edges are finely toothed. Flowers are tubular and violet-blue in color, with five petals. They form where the leaf joins the stem. Venus looking glass is not a particularly aggressive weed, but it can be a problem in thin turf.