Sow seeds about one inch deep, three to four inches apart. Although you can plant in rows, they can be planted densely and allowed to form a canopy. This will help control weed growth. Soybeans are tolerant of drought and poor soil since they fix nitrogen. They will, however, benefit from fertile soil.
Soybean flowers are perfect (self-fertile) and cross pollination is almost non-existent, making saving seed easy. Allow pods to fully develop and dry on the plants.
Note: If you are unfamiliar with natto, it is a traditional, and very ancient, Japanese food made by fermenting soybeans with Bacillus subtilis or Bacillus natto. It is a popular breakfast food in some regions of Japan but can be an acquired taste due to its strong smell and flavor, as well as its slippery texture.
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