How to Grow Annual Vinca
Catharanthus roseus
Annual vinca thrives in full sun and well-drained soil. Sow indoors 10-12 weeks before the last frost at 21-27°C, covering seeds as they need darkness to germinate. Prick out into modules once true leaves appear, keep warm throughout, harden off carefully, and plant out 30cm apart only when all frost risk has passed and nights are warm. Water at the base to avoid root rot and deadhead to keep blooms coming all summer.
When to Start
Start seeds indoors 12 weeks before your last frost date. Transplant outdoors once night temperatures stay above 12°C and soil has warmed to at least 20°C.
Don't know your frost date? Find it here →
Growth Stages
Approximate days from start
Care Essentials
- Feed every two weeks with a balanced or high-potash liquid fertilizer once flowering begins.
- Thrives in heat and tolerates drought once established — ideal for hot sunny borders, containers, and hanging baskets. Avoid overwatering which causes root rot.
Growing Conditions
- Min. soil temperature
- 20°C+
- Germination temperature
- 21–27°C
Pet Safety
- Sow indoors
- —
- Transplant out
- —
- First harvest
- —
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Spacing & Planting
| Plant spacing | 30 cm |
| Row spacing | 30 cm |
| Sow depth | 0.5 cm |
| Mature height | 40 cm |
| Mature spread | 30 cm |
Growing Conditions
| Min. soil temperature | 20°C |
| Germination temperature | 21–27°C |
| Base growth temperature | 12°C |
| Min. daylength to start | 12h |
| Photoperiod sensitivity | day neutral |
Frequently Asked Questions
- How far apart should I plant Annual Vinca?
- Plant Annual Vinca 30cm apart with 30cm between rows.
- When does Annual Vinca flower?
- Annual Vinca typically flowers approximately 42 days after transplanting.
- Is Annual Vinca frost hardy?
- Annual Vinca is classified as Tender.
