Soybean Seeds,
Midori Star

Plant Midori Star Soybean seeds after all danger of frost has passed and soil temperatures are consistently above 60 F. In regions with short summers, start seeds indoors and transplant once soils warm. Soybeans flower on daylength, so later sowings mature at nearly the same time on smaller plants; grow two or three varieties of different maturity to stagger the fresh edamame harvest. If you're not sure how to find your first and last frost dates, consult our blog post 'Our Experts Answer Questions, Share Resources.'

Sow seeds 1 inch deep in well-drained soil rich in organic matter. Space seeds 6 inches apart in rows spaced 18–24 inches. Water thoroughly after planting and maintain consistent moisture until seedlings are established. Avoid compacting the soil, as soybeans develop extensive root systems that benefit from aeration and light cultivation.

Once established, soybeans require minimal maintenance. Provide consistent moisture during pod development but reduce watering as pods mature. Avoid high-nitrogen fertilizers, as soybeans fix their own nitrogen through root nodules. Keep weeds under control early in the season, as soybeans do not compete well before canopy closure. Harvest young pods when fully filled but still green for fresh edamame.

• Allow pods to mature fully on the plant until dry and brittle.
• Harvest pods before they shatter and remove seeds carefully.
• Spread beans in a single layer to air-dry for 1–2 weeks.
• Store in airtight containers in a cool, dry place.
• Properly stored seeds remain viable for up to 3 years.