What Zone to Grow a Corkscrew Vine?
- When temperatures remain above freezing and become tropical, such as highs over 80 degrees and lows no lower than 50 degrees, snail vine grows quickly. In three to five months, one plant can climb up as much as 10 to 20 feet on a pole or trellis. Flowers develop in spring or summer once weather remains consistently warm. In the northernmost U.S., flowers may not occur until late August. Pollinated flowers yield seed pods that split open. Numerous seedlings may pop up in a landscape, becoming nuisance weeds.
- Snail vines persist as perennials in U.S. Department of Agriculture plant hardiness zones 9 and warmer. If winters are unusually mild in zone 8b, plants may rejuvenate in mid to late spring after being killed back to their roots. In zones 10b and warmer, where temperatures never drop below 35 degrees, the plant persists with evergreen foliage that resembles that of vegetable pole beans.
Sunset Climate Zones
- In the western United States where the USDA hardiness zones are difficult to use because of the variable elevation across many latitudes, gardeners use Sunset climate zone designations. Snail vine remains an evergreen vine in climate zones H1, H2 and 24. Winter frosts and mild freezes kill back the plant in zones 12 through 23. In the eastern U.S. Sunset climate zones 25 and 27 don't receive winter frosts. It grows as a die-back perennial in zones 26 and 28. In all other Sunset climate zones, snail vine may be grown as a summer annual.
- Sow seeds indoors one month before the last spring frost date to get a head start when growing corkscrew vine as a summer annual. Sow seeds or plant seedlings outdoors when nighttime temperatures no longer drop below 40 degrees -- about the same time you plant tomatoes outdoors in your area. An organic rich, non-alkaline soil that remains moist but well-drained promotes fastest, lushest growth. Full sun promotes the best flowering and warmest conditions. Avoid planting corkscrew vine in windy sites, especially in regions with low ambient humidity.