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Potting soil absorbs the most water of your choices. One often adds perlite to potting soil to increase its drainage. Some people also like to put a layer of gravel at the bottom of their planter for this reason. Gravel has good drainage. The worst drainage is clay. Soil has several constituents. Hummus is organic matter high in nutrients and absorbent. The organic matter is important but it absorbs a lot of moisture which can lead to fungus. Sand or gravel increases drainage but alone is terrible quality soil because it has no mineral nutrients or organic matter. Clay is mineral rich but very dense. Water pools on top of it. It has terrible drainage and little organic matter. Poor soil is usually some mixture of sand and clay.

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Q: Which soil is absorbing sand gravel or potting soil?
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