Most of the literature suggests that roots should not be sitting - TopicsExpress

Most of the literature suggests that roots should not be sitting in water. There are two reasons why this is occasionally true. First, the sitting water might not have dissolved oxygen. The roots utilize oxygen and will incur diseases without it. Second, some mediums are incredibly dense and take up so much water that there isn�t any air left. The roots then suffer from a lack of oxygen. In a reservoir system, large air spaces are left in between pieces of clay pebbles or lava so that there is enough air and the roots can access the oxygen more easily.

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