What plants improve the soil?

Some types of herbs, including pike-cola (sandstone), can be planted on the coastal dunes. Their rocks penetrate the sand and hold the dunes in place. Plants also create a layer of humus (rotten plant material) that enriches the soil. Plants can even purify the land polluted by industrial waste. Some of their types adapted to poisonous substances. They gradually increase the fertility of the soil, as if they were rebuilding it. And over time, other plants can grow on it.

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