  
            Hardy, heat-loving perennial named for knees at its leaf 
            nodes, showing tiny greenish flowers on spikes in summer. This China 
            native has naturalized throughout the subtropics. 
            Grow specs: 2-3 ft. Full sun. 1-2 ft. apart. 
              Ordinary garden loam. Traditionally used to strengthen liver and 
              kidneys, as well as supporting muscle and bone structure. Contraindicated 
              for use during pregnancy.  
            $3.00 
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