Also known as Myrtle. Periwinkle is probably the most popular evergreen groundcover, forming a dense mat. This exciting selection has bright golden-yellow leaves edged in green, studded with blue flowers in spring. Tolerates dry shade once plants are established. Stems root into the ground readily. Mowing the patch low after blooming every couple of years will help to keep it thick and weed resistant. Plant 4 to 10 plants per square yard. USPP#12132, CPBR#1632: unlicensed propagation prohibited. May be considered invasive in some areas, do not discard unwanted plants in compost or in natural areas where these can become established.