Annual vegetable
Yardlong Bean plant profile
Vigna unguiculata subsp. sesquipedalis
An annual vegetable for full sun.
Last updated .
When to plant
When to plant Yardlong Bean
Yardlong bean is a warm-season, frost-intolerant annual climber. Sow seeds outdoors after the last frost once the soil is warm (NC State).
The calendar shows this cited seasonal window as an approximate band. It does not convert the season into frost-adjusted dates.
Open Yardlong Bean in my garden calendarShows the source-backed planting season, not frost-adjusted dates.
Growing conditions
- Sun
- Full sun
- Soil pH
- 5.5 to 6.5
- Lifecycle
- Annual
- Spacing
- 12 in apart
Common problems
Watch for these
Also watch for: bean beetles, root knot nematode.
Evidence trail
Evidence behind this profile
Original extension and institutional publications behind the planting, care, and safety facts on this page.
- Vigna unguiculata (Yardlong Bean, Asparagus Bean)
North Carolina Extension Gardener Plant Toolbox. Supports general reference. Checked 2026-06-18.