According to the USDA, baldcypress has a taproot with horizontal roots that lie just under the surface and spread for 20-50 feet before bending down. The “knees”, which are outgrowths of the lateral root system, are thought to provide support for the tree.
Karren Wcisel, TreeTopics.com
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Pinaceae, tree, conifer, cone, needle, deciduous conifer, Taxodium distichum, baldcypress