Daikon radishes are used as cover crops. Their thick roots penetrate 1-2 feet into the ground, and not long after they were seeds, they are done. Farmers leave the roots in the soil to decompose into good organic matter for other plants, and use the leaves (working them into the soil, I think) for the same purpose.

I think they are used to improve sandy and clay soils. Gardeners can consider using them where they plan to plant vegetables or flowers, along with other cover crops like clover and other nitrogen-fixing legumes.

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