Periwinkle 'Ralph Shugert' (Vinca minor): Variegated Evergreen Groundcover

Overview

Vinca minor 'Ralph Shugert' is a distinctive cultivar of common periwinkle, valued for its dark green leaves edged with a crisp, creamy-white margin. Like the species, it forms a dense, evergreen carpet smothered in violet-blue flowers in spring, but the variegation adds season-long brightness to shaded areas.

Botanical Description

Trailing stems root at nodes to create a mat 10–15 cm tall, spreading indefinitely. Leaves are opposite, ovate, 2–4 cm long, glossy dark green with a narrow, irregular white border. Single, five-petaled flowers are 2–3 cm wide, lavender-blue, borne in leaf axils from April to May, with sporadic rebloom. The cultivar was discovered in the 1980s and named for Pennsylvania nurseryman Ralph Shugert.

Taxonomy

Family:	Apocynaceae (a-pos-ih-NAY-see-ee)
Genus:	Vinca (VIN-kuh)
Species:	minor (MY-nor)
Cultivar:	'Ralph Shugert'

Growing Conditions

• Light: Part shade to full shade; tolerates sun in cool, moist climates.
• Soil: Adaptable; prefers moist, humus-rich, well-drained.
• Moisture: Regular water for best growth; tolerates dry shade once established.
• Hardiness: USDA zones 4–9.

Landscape Uses

Classic groundcover for under trees, on shaded banks, and along north-facing walls. The white-edged foliage brightens dark corners. Space plants 30–45 cm apart for full coverage in 2–3 years. Can be mowed on high setting in early spring to rejuvenate.

Invasive Potential

Caution: Vinca minor is invasive in many temperate forests of North America, spreading vegetatively and displacing native spring ephemerals. Many states list it as a noxious weed. Use with restraint near natural areas; consider native alternatives like Phlox stolonifera, Tiarella, or Asarum canadense. In contained urban gardens, risk is lower.