🌞 Vinca
Catharanthus roseus
The flower that laughs at August.
Sun
Full sun, 6+ hrs
Days to harvest
Blooms ~3 months from seed; perennial in zone 10–11
Spacing
8–12 inches apart
Soil pH
6.0–7.0
How to grow
Transplant after nights are reliably warm — vinca planted into cold soil just sits there. It's the undisputed champion of Florida summer annuals, blooming through heat that murders everything else. Don't over-amend; it prefers lean soil.
Water & feeding
Water at the base, never overhead — wet foliage invites the blight that kills vinca. Once established it's quite drought-tough.
Common problems
- Phytophthora aerial blight in wet weather — water at soil level, mulch
- Loves heat but hates cold soil; planting too early stunts it
- Few insect pests — one of its superpowers
Harvest
Self-cleaning; no deadheading. Cut stems for small bouquets — they hold a few days.
Nerdy fact: Vinca gave medicine two famous chemotherapy drugs — vincristine and vinblastine were first isolated from its leaves, so this tough little flower literally saves lives.