Climate matters. This page is a practical baseline. Confirm cultivar, local frost/heat conditions, mature size and regional restrictions before planting.
Yardlong Bean — Growing reference
| Scientific name | Vigna unguiculata subsp. sesquipedalis |
|---|---|
| Seed germination (days) | 5–10 |
| Soil temperature for germination (°C) | 21.1–35 |
| First harvest or flowering (days) | 60–80 |
| Measured from | Seed |
| Plant spacing (cm) | 15.2–30.5 |
| Mature height (cm) | 304.8–457.2 |
| Mature spread (cm) | 30.5–61 |
| USDA hardiness zones | 7–11 |
| Light | Full sun |
| Water | Moderate |
| Sowing method | Direct sow |
Growing directions
Sow seeds 1 in deep once soil is reliably warm; yardlong beans are vigorous climbers that need a sturdy trellis or fence at least 6 feet tall. Unlike common beans, they thrive in high heat and set pods prolifically during summer weather that causes snap beans to drop their blossoms. Harvest when pods are pencil-thin and roughly 12–18 in long, well before they reach their potential 36 in — longer pods become fibrous and bitter. Check daily once pods begin forming, as they move from prime to over-mature in just 2–3 days.
Source and local conditions
Typical planning ranges from OpenPlantDB (CC0). Cultivar, climate, season and growing method can change these values. Confirm the seed label and local guidance before planting.
Source & verification
OpenPlantDB · CC0