Vinca (Madagascar Periwinkle) in Zone 8a & 8b

Catharanthus roseus

When to plant vinca (madagascar periwinkle) in zone 8b

Zones 8a and 8b share the same average frost dates in our data, so this page covers both.

Method: Start indoors: Start indoors from seed, then transplant outside. Vinca (Madagascar Periwinkle) needs a head start most zones can't give it by direct-sowing alone.

Start indoors	Jan 14–Jan 21
Direct sow / transplant outside	Apr 8–Apr 15
Estimated bloom	Jun 27–Jul 4 (~80 days after transplanting)

Spacing: 1 per square foot (square-foot-gardening spacing). Mature height: 1-1.5 ft.

Vinca (Madagascar periwinkle, botanically Catharanthus roseus) is built for heat that stops other flowers cold. Growing In The Garden describes it as synonymous with hot weather in the low desert, blooming through Phoenix summers with little fuss once it's established, a low, 12- to 18-inch mound of flat, five-petaled pink, white, or red flowers, often with a contrasting eye at the center.

How vinca (madagascar periwinkle) fits zone 8's season

Zone 8b's frost-free window runs about 230 days, from March 25 to November 10. Vinca (Madagascar Periwinkle) needs about 80 days from transplant to first harvest.

Good companions

No standout companions recorded yet for Vinca (Madagascar Periwinkle).

Where to buy vinca seeds

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