8 per square foot in 2 rows of 4. Does better with some support. Could even be a wire wicket bent at 30 cm (12″).
Lay seeds on their side and cover with 2 cm (1″) of soil. Firm the soil with your fingers.
Hot and sunny. Loamy soil, pH around 6-6.5.
Seeds will sprout in 6-16 days.
Aphids and spider mites. Both can be washed off with a hard jet of water.
Direct sow starting in mid-May. Warm-weather crop. Best soil temperature is at least 21°C (70°F). Since all the pods on a plant are ready to pick at once, make successive sowings — every week or two — to ensure fresh edamame all summer long.
Apart from daily watering, your only care consists of spraying leaves with kelp fertilizer periodically to boost nutrient uptake.
Days to maturity