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I heard from a nursery owner in San Antonio, TX that the knees are sometimes a response to roots not getting air. He said that is why they tend to pop from underneath water. At this nursery, all of the cypress were putting up knees and he told me this was because a previous owner had laid down plastic sheeting to prevent weeds. The lack of air caused them to develop knees. I don't know if this would explain the knees forming in some landscape situations or not.

4-Feb-2005	#5
meshako bonsaiTALK Neophyte Join Date: Jul-2004 Posts: 2	Cypress Knees I heard from a nursery owner in San Antonio, TX that the knees are sometimes a response to roots not getting air. He said that is why they tend to pop from underneath water. At this nursery, all of the cypress were putting up knees and he told me this was because a previous owner had laid down plastic sheeting to prevent weeds. The lack of air caused them to develop knees. I don't know if this would explain the knees forming in some landscape situations or not.