Vinca (Periwinkle)
Vinca, or periwinkle (Catharanthus roseus), a tender annual native to Madagascar, thrives in June’s heat and drought, making it ideal for beds and containers. Sow seeds or transplant seedlings once soil temps reach 65°F, spacing them 6–8 inches apart in well-draining, nutrient-rich soil with at least six hours of sun. Their glossy, dark-green leaves support cheerful single blooms in shades of pink, purple, red, and white that persist even as higher summer temperatures set in. I remember planting a bed of periwinkles last June, and they filled in bare spots within weeks, offering non-stop color even when other annuals faded.
One wonderful aspect of periwinkle is its ability to attract pollinators while discouraging pests. Though their star-shaped flowers appeal to small butterflies and certain solitary bees seeking nectar, the foliage isn’t particularly palatable to deer or rabbits—perfect if wildlife pressure is high in your area. Vinca is not considered invasive in most temperate zones, provided you remove spent blooms and avoid letting seeds blow into natural areas. In addition, periwinkle’s robust form suppresses weeds, reducing habitat for slugs and snails that prefer lush, damp foliage. With minimal maintenance beyond occasional deadheading, periwinkles planted in June will flourish until the first frost, delivering reliable summer cheer.