Edamame

Vegetable

Glycine max

Edamame is fresh soybean harvested green and immature, boiled in the pod and salted - one of the most satisfying crops to grow and eat in the summer garden. As a nitrogen-fixing legume it improves soil fertility for following crops. Plants are compact, productive, and rewarding for beginners.

Native Range

Origin: Domesticated in northeastern China from wild soybean (Glycine soja).
Native Habitat: The wild ancestor Glycine soja grows in thickets, forest margins, and disturbed ground in northeastern Asia.
Current Distribution: Cultivated globally as one of the world's most important crop plants; grown in over 100 countries.

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Growing Conditions

Sunlight

Full Sun

Water Needs

Moderate

Soil

Well-draining loam; pH 6.0 - 6.8; avoid excess nitrogen

Spacing

4 - 6 inches

Days to Maturity

75 - 90 days from direct sow

Growing Zones

Thrives in USDA Zones 3 - 10

Companion Planting

Good Companions

Keep Away From

When to Plant

Direct Sow
After last frost, soil 65°F+
Harvest
75 - 90 days; harvest when pods are plump and bright green before they yellow

Phenology (Natural Timing Cues)

Direct Sow

Edamame needs genuinely warm soil to germinate reliably - 65°F at planting depth minimum, with warm nights above 50°F. Cold soil causes rot rather than germination. Sow in succession every 3 weeks through summer for a continuous harvest. Pods must be caught at exactly the right moment: bright green, plump, and firm; once they start yellowing they become starchy dry beans rather than sweet edamame.

Lilacs have faded and soil at planting depth feels warm.
Night temperatures are staying reliably above 50°F.
Tender annual weeds are growing vigorously without cold setback.
Last frost is at least 2 weeks behind you.

Start Dates (Your Location)

Based on your saved growing zone and this plant's timing notes.

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Typical Last Frost

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Organic Growing Tips

Inoculate seed with Bradyrhizobium japonicum at planting to ensure nitrogen fixation.
Plant in blocks rather than rows to improve pollination and pod set.
Harvest the entire plant at once when 80% of pods are plump - flavor peaks briefly.
After harvest, chop plants and till them in to return fixed nitrogen to the soil.

Common Pests

Mexican Bean Beetle
Aphids
Spider Mites
Japanese Beetle
Corn Earworm

All pest management in Garden uses safe, organic, non-toxic methods only. No synthetic pesticides, ever.

Taxonomy

Kingdom: Plantae
Family: Legume family (Fabaceae)
Genus: Glycine
Species: max

Natural History

Glycine max was domesticated from wild soybean (Glycine soja) in northeastern China approximately 3,000 years ago, though archaeological evidence suggests cultivation as early as 5,000 BCE in the Yellow River basin. The Shennong Bencao Jing, a foundational Chinese agricultural text, lists soybeans among the five sacred grains of Chinese civilization alongside rice, wheat, millet, and hemp. For most of its long history the plant was grown for dry beans, fermented products such as miso and tofu, and oil extraction. The edamame tradition - eating fresh green soybeans - developed within Japanese cuisine, with the earliest clear references appearing in Japanese texts from the 17th century. Japanese farmers developed specific edamame varieties selected for sweetness and tenderness. Benjamin Franklin is often credited with sending the first soybean seeds to the American Philosophical Society from Paris in 1770. The US is now the world's largest soybean producer, though virtually all of that production is for oil, meal, and processed food ingredients rather than edamame.

Morphology (Plant Structure & Identification)

Root System
Fibrous, moderately deep roots with rhizobial nitrogen-fixing nodules when appropriate soil bacteria are present.
Stem
Erect, hairy, bushy stems 18 - 30 inches tall; self-supporting; branching habit produces multiple pod-bearing nodes.
Leaves
Trifoliate leaves similar to common beans; alternate; hairy on both surfaces; medium to dark green.
Flowers
Small, inconspicuous pinkish-white or purple self-pollinating flowers held in clusters at leaf axils.
Fruit
Fuzzy green pods 2 - 3 inches long with 2 - 3 seeds each; harvest at full green plumpness before yellowing begins.

Known Varieties

Common cultivars worth knowing

Envy
Early 75-day variety with excellent flavor and reliable production; well-suited for short seasons.
Best for: short seasons, beginners
Midori Giant
Large-podded variety with 3 beans per pod and outstanding flavor; 80 days.
Best for: flavor, farmers markets
Butterbeans
Sweet, creamy edamame with larger beans and a buttery flavor; 85 days.
Best for: fresh eating, summer harvest
Beer Friend
Japanese specialty variety with exceptional sweetness; developed specifically for fresh eating.
Best for: gourmet use, fresh snacking

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