Periwinkle

Periwinkle is a perennial ground cover of periwinkle blue flowers over a mat of green foliage. It tolerates clay and alkaline soils.Can be used under trees or to prevent erosion on slopes. Can spread via its vines which grow roots. Periwinkle has been used for its medicinal properties for 2,000 years. Periwinkle may show minor toxicity in pets if ingested. 

Medicinal
Companions: coneflower, basil, black-eyed susan, yarrow, lavender, catmint
Light: Full Sun to Part Shade
Height: 4-6"
Spacing: 24"
Blooms: May to June
Drought Tolerant: yes
Perennial: Zone 3
Deer Resistant: yes
Latin: Vinca minor