Plant Size (Height): 10-14"
Plant Size (Width): 6-8"
Lifespan: Annual
Sun Requirements: Full Sun
Sun Requirements: Partial Shade
Soil Preference: Well-Drained
Water Needs: Low
Drought Tolerant: ✔️
Container Friendly: ✔️
Blooming Season: Spring
Blooming Season: Summer
Bloom Color: White
Bloom Color: Red
Bloom Color: Purple
Wildlife Interactions: Beneficial to Bees
Wildlife Interactions: Beneficial to Butterflies
Starting Vinca Indoors
Indoor sowing works best because vinca seeds require dark, warm conditions. Start seeds 10-12 weeks before your last frost date. Use a sterile, seed-starting mix and plant seeds about 1/8 inch deep. Since they need darkness to sprout, cover lightly with soil or vermiculite. Keep the temperature between 75–78°F and maintain even moisture without overwatering.
Seeds usually sprout in 10-15 days. Once seedlings emerge, provide strong light for 14-16 hours a day. Thin crowded seedlings and grow them in individual cells or small pots to avoid disturbing the roots later. Before transplanting outdoors, harden seedlings for about a week by gradually introducing them to outdoor conditions.
Plant outside only after nights stay above 60°F and the soil has warmed. Space plants 8-12 inches apart in well-drained soil. Water sparingly, allowing the soil to dry slightly between waterings, since vinca dislikes soggy ground.
Direct Sowing Outdoors
Direct sowing vinca is less dependable, but it can be done after frost when soil temperatures reach at least 70°F. Sow seeds shallowly, about 1/8 inch deep, and press the soil gently. Keep the area moist until seedlings appear, then thin to 8-12 inches apart. Outdoor germination can be patchy since vinca requires steady warmth and darkness to sprout.