The tap roots of green beans reach 3′ or more, but most of the roots are found in the top 2-8″ of soil. The reference below has root depths and sketches for most vegetable crops.
The taproot of a bean serves an important function not only for the bean itself, but the surronding soil as well, in that it delivers nitrogen rich nutrients into the ground that is vital for the life of the soil. When the roots rot they also act as an embedded fertilizer that helps the soil stay healthy. Compared to other crops, beans have a “deep rooting” of over 48 inches, putting them in the same league as pumpkins, squash, sweet potatoes, and artichokes.
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