Cypress knees have caused damage to septic pipes and knees are constantly doing damage to lawn mower blades. my house is built off the ground and on cement blocks and i suspect a cypress knee is growing under a cement block up to the point my floor inside is rising up. I also have numerous cypress knees visible under the house that need to be cut before they grow through the floor, I am 69yrs and can not do the work I am in Louisiana. Cypress trees are on neighbors property close to property line.
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