Nodules

These small round nodules form on the roots of legumes (aka beans). Legumes pull nitrogen out of the air and collect it in these structures on their roots. If you cut the spent bean plants off at soil level, or if most of the roots and nodules stay in the soil when you pull up the plants, the break down of the nitrogen rich nodules is supposed to be great for nitrogen loving veggies, which includes leafy greens such as lettuce, kale and spinach.

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