12-30-2011, 06:25 PM
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yeah a hardwood like that can cause problems. Aquatic plants don't really have the roots able to dig in to a solid dense object. Their roots are soft were as non-aquatics have much tougher and stronger roots. They also rely on them a lot more for nutrient, water absorption and in the case of tree for stabilizing and supporting the plant upright. Aquatics need roots for some nutrient absorption, but the main function is just to hold the plant in place. The vals in the pic have pretty small root systems compared to most plants.