Step-by-Step Growing Guide
Edamame (Glycine max) requires full sun, warm soil (at least 60°F, preferably 70°F+), and a long warm summer. Sow directly in the garden after last frost, 1–1.5 inches deep and 2–4 inches apart in rows 18–24 inches apart. Do not start indoors — soybeans develop a taproot quickly and resent transplanting. Inoculate seed with soybean-specific Bradyrhizobium japonicum before sowing in plots where soybeans have not been grown before; this dramatically improves yield. Plant in well-drained, moderately fertile soil with a pH of 6.0–7.0. Apply phosphorus and potassium but no nitrogen — the nitrogen-fixing symbiosis provides all the nitrogen the plant needs. Water consistently at 1 inch per week, particularly during pod fill. Edamame is susceptible to drought stress during flowering and pod development, which causes aborted pods and poor seed fill. In short-season climates, choose early-maturing varieties (under 75 days). Harvest the entire plant or individual pods before seeds fully mature.