annual vegetable
Black soybean
Black soybean is an annual vegetable noted for edamame type and black seed. It grows in USDA zones 4a-10b, prefers full sun and loam soil, and harvest timing is pods or dry beans in summer. It is commonly used for boiled young and dried and simmered.
Fit and caveats
Black soybean is a legume crop whose fit depends on soil temperature, support, and harvest stage. Beans and southern peas are usually direct-seeded, but they split into cool-season, warm-season, bush, pole, snap, shell, and dry-use categories.
Best fit
- Warm direct-seeded beds in its listed growing range after soil has warmed.
- Gardeners who want a lower, simpler row or container crop without major support.
- Successive sowings where repeated harvest matters more than one large planting.
Use caution
- Beans seeded into cold wet soil rot easily.
- Bush beans crop over a shorter window, so stagger plantings if you want continuous harvest.
- Some specialty beans need a long warm season and may not mature dry seed in cool ZIPs.
Regional notes
- In hot Southern gardens, cowpeas and yardlong beans often handle summer better than common snap beans.
- In cool climates, choose earlier-maturing beans and avoid heavy clay until it warms.
- Avoid excess nitrogen; legumes do not need the same fertility push as corn or leafy greens.
Comparison note: Compared with sweet corn, Black soybean needs less fertility but more attention to harvest timing. Compare legumes by season, support, pod type, and whether the goal is fresh pods, shelling beans, or dry seed.
Photos
Photos show a representative plant in the garden. Cultivar appearance, fruit color, bloom timing, and growth habit can vary by site and season.
Photo sources: USGS Bee Inventory and Monitoring Lab from Beltsville, Maryland, USA (Public domain)
Harvest and uses
Black soybean is a soybean eaten cooked -- boiled young like edamame or dried and simmered -- and used in East Asian cooking and ferments; soybeans must always be cooked.
When to pick
- Fresh
- For fresh 'shelly' beans, pick when the pods are plump but still soft; for dry beans, leave the pods on the plant until they are brown, dry, and rattle.
- Preserve
- Dry beans fully before storing airtight; shell fresh beans just before cooking.
- Ferment
- Soybeans are traditionally fermented (miso, tempeh, natto); most beans are not.
Ways to use the harvest
Boiled young
Cooked in the pod like edamame when green.
Like edamame.
Dried and simmered
In soups, stews, and simmered dishes (kuromame).
Ferments
The base of some Asian ferments (miso, douchi).
Dry storage
Stored like other dry beans.
Note
soybeans must be cooked; raw soybeans contain trypsin inhibitors.
dry beans must be boiled thoroughly before eating.
Drying and storage
Dry beans fully, then store airtight in a cool, dark place for a year or more.
Freezing
Blanch and freeze fresh-shelled beans.
Canning
Pressure-can after soaking and pre-cooking (low-acid).
Simmered black soybeans (kuromame)
A sweet Japanese New Year dish.
In soups
Cooked until tender.
Fermentation
Most shell and dry beans are cooked rather than fermented, though soybeans are the base of miso, tempeh, and natto.
- Estimated sugar
- Those soy ferments require specific cultures.Use a refractometer or hydrometer if sugar level matters for wine, mead, or other fermentation planning.
- Acidity
- Beans are not a brewing fermentable.
Nutrition
Shell and dry beans are high in plant protein, fiber, folate, iron, and potassium; they must be cooked, which also improves digestibility.
Food safety
Soybeans must be cooked and are never eaten raw: raw soybeans contain trypsin inhibitors and lectins that cooking destroys. Because soybeans are low-acid, home-canned soybeans must be pressure-canned.
Spacing, yield, and timing
How far apart should you plant Black soybean?
Plant Black soybean at 0.3-0.5 ft in-row x 2-3 ft rows. Adjust this starting point for trellises, hedges, rootstock, containers, pruning style, or local extension guidance.
How much does Black soybean produce?
Black soybean yield is modeled as 0.3-0.7 lb/plant/season. Treat that as a planning range, because weather, soil, watering, pruning, pests, and local pressure can change the real result.
How long does Black soybean take to produce?
Black soybean usually reaches first useful harvest or display in 75-95 days under suitable conditions.
How do you grow Black soybean?
Grow Black soybean in USDA zones 4a-10b with full light, loam soil, and medium water. Use 0.3-0.5 ft in-row x 2-3 ft rows for layout planning. Match the plant to drainage, heat, chill, and pest pressure before scaling up.
Can Black soybean grow in a container?
Black soybean can start with a container of about 5+ gal (workable). Larger containers usually buffer heat and moisture swings better than the minimum.
- 10-year return
- 3-7 lb/10 yrs
- Full output
- This season
- Planting depth
- Set transplants at nursery depth or follow seed-packet depth for direct sowing.
- Productive life
- 1 yrs
- Difficulty
- 2/5
- Reliability
- 3/5
- Data quality
- Medium profile, Medium yield confidence
Yield varies most with climate, soil, rootstock, pruning, pest pressure, and wildlife.
Estimated Pound Return
Medium yield confidence- Year 1
- 0.3-0.7 lb First-year estimate from the sourced curve.
- Year 5
- 0.3-0.7 lb
- Year 10
- 0.3-0.7 lb
- 10-year total
- 3-7 lb/10 yrs
Shaded band shows the sourced low-to-high pound-yield range. The line tracks the midpoint for quick comparison.
Method: direct pound yield from crop metric source. Annual crops assume one comparable planting per year; perennial crops ramp from first bearing to full production.
Planting, care, and risk checks
Checklist
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Seed-starting trays
Propagation / Pre-seasonStart annual vegetables, herbs, and flowers ahead of transplant season.
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Right-size container with drainage
Containers / Before plantingUse a container large enough for mature roots, with open drainage holes to prevent root rot.
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Expanding container potting mix
Containers / Before plantingUse a lighter container medium instead of dense garden soil in pots and grow bags.
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Seedling grow light
Propagation / Pre-seasonKeep indoor seedlings compact and sturdy before they move outside.
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Floating row cover
Protection / At plantingProtect young crops from wind, light frost, and early pest pressure while still letting light and water through.
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Balanced garden fertilizer
Nutrition / During growthFeed annual vegetables, herbs, flowers, and hungry container crops according to soil or label guidance.
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Soil thermometer
Timing / Before plantingCheck whether spring soil is actually warm enough for direct sowing, transplanting, and tender warm-season crops.
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Soil test kit or lab mailer
Site prep / Before plantingCheck pH and baseline nutrients before adding amendments, especially for fruiting crops, native beds, and acid-loving plants.
Planting strategy
- Planting depth: Set transplants at nursery depth or follow seed-packet depth for direct sowing.
- Container minimum: 5+ gal (workable). Use 5+ gal for most single vegetable plants; smaller leafy/root crops can use less.
- Start with one plant when testing fit in a new bed or container.
- Plant more than one when harvest volume or pollination is the main goal.
Risk factors
- Deer pressure: Not rated. No deer-resistance category is assigned yet; treat browsing risk as local and variable.
- Black walnut: Mixed or uncertain. Use as a black walnut / juglone planning cue; tolerance varies by cultivar, soil, and distance from the tree.
- Match the site first: full light, loam soil, and medium water.
- Use 0.3-0.5 ft in-row x 2-3 ft rows as the first spacing model; adjust for hedges, trellises, containers, or local guidance.
- Plan around mature size: 1.5-3 ft H x 1-2 ft W.
- For harvest planning, treat "pods or dry beans in summer" and 0.3-0.7 lb/plant/season as planning ranges, not guarantees.
- Local drainage, pests, chill hours, wildlife pressure, and microclimates can change the result.
Comparable plants
Sources and methodology
This guide combines hardiness range, light, soil, water, harvest timing, traits, supplier links, plant relationships, and quantitative planning metrics. Pairings are screened for practical garden fit.
Quantitative values use extension and botanical-reference ranges where available. For less-studied cultivars, similar crops fill gaps conservatively. Ranges are intentionally broad so the profile stays useful without pretending to be exact.
Planning sources: UGA Extension - Growing Vegetables OrganicallyCornell Cooperative Extension - Recommended Spacing and Expected Yield for Garden VegetablesUniversity of Maine Extension - Planting Chart for the Home Vegetable GardenUniversity of Maryland Extension - Types of Containers for Growing VegetablesIllinois Extension - Growing Vegetables in Containers
Editorial sources: University of Minnesota Extension: Growing beans in home gardensUGA Extension: Home GardeningUniversity of Minnesota Extension: Growing staple vegetables from around the world in MinnesotaClemson Cooperative Extension: Chinese Vegetables
Use & preservation sources: National Center for Home Food Preservation: Canning BeansUtah State University Extension: Killer Kidney Beans (bean lectins)USDA FoodData Central
Supplier search: Amazon. Search links are not paid placements unless explicitly marked; affiliate listings may earn a commission. Last reviewed: 2026-05-31.