VegetableBean
Kurosanjaku Yard Long Bean
Kurosanjaku Yard Long Bean is a heat-loving Asian heirloom that produces remarkably long, slender dark green pods in just 70 to 79 days. This vigorous vining bean thrives in warm climates across hardiness zones 3 through 11, rewarding gardeners with abundant harvests of stringless, sweet pods that stay tender and crunchy even as they mature. Its black seeds and open-pollinated genetics make it a favorite among seed savers and specialty vegetable growers seeking authentic Asian varieties.
Photo © True Leaf Market
Growing Conditions
USDA Zone
3-11
Sunlight
Full Sun
Water
Moderate
Soil
Well-drained, Fertile Loam
Growth Stats
108 in
Height
TypeVining
Spacing
4
Plant Profile
Sunlight
Full Sun
Water
Moderate
Zones
3-11
Size
108in H x ?in W
Growth
—
Care
High
Hover over chart points for details
Highlights
These extra-long dark green stringless beans deliver a sweet and crunchy bite that keeps many growers coming back year after year. The Kurosanjaku thrives in heat rather than wilting under summer stress, making it one of the most reliable yard-long bean varieties for warm-season gardens. High yields from a single planting mean you'll have plenty for fresh snaps, stir-fries, or long-term seed saving.
Common Uses
Harvest these beans at 6 to 8 inches long for the most tender, sweet texture in stir-fries, the most traditional preparation. They're equally delicious steamed whole as a simple side dish, braised in aromatic broths, or snapped raw into salads. Some gardeners let pods mature fully for shell beans, though they're primarily grown for eating the entire young pod.
Growing Timeline
No timeline data available yet for this variety.
Care Instructions
Direct Sow
Direct sow seeds into warm soil after the last frost date, planting 1 inch deep and spacing seeds 4 inches apart in rows 24 inches wide. Soil should be at least 60 degrees Fahrenheit for reliable germination.
Harvesting
Pick pods when they reach 6 to 8 inches long for the sweetest, crunchiest texture. The beans should snap cleanly when bent and have a tender feel without any hard seeds visible through the pod skin. Begin harvesting at 70 to 79 days after planting, checking vines every 2 to 3 days during peak production since mature pods toughen quickly. Cut or gently snap pods from the vine to avoid damaging the climbing stems.
Pruning
No pruning is necessary for this vigorous vining variety. Simply guide the long vines onto a sturdy trellis or arbor and let them climb freely for maximum air circulation and ease of harvest.
Growing Calendar
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Companion Planting
Pests & Diseases
Ecology & Traits
Edible
Scientific Classification
Vigna unguiculata subsp. sesquipedalis
Family
Fabaceae
Genus
Vigna
Growth Habit
Vining
Native Status
L48 (I)PR (I)VI (I)