My Cypress tree sending out roots into the neighbors yard.

Nothing unless you cut down the tree and probably a good bit of it’s root system.

I had 2 cypress trees in my backyard at my old house. Once every year or 2 id go around the yard with a pickaxe and remove as many new knees as I could find.

If there are a lot then rent a stump grinder and go to town.

Does he not cut his grass?

I just run over mine with the mower every week.

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Neighbor mentioned it to me the other day. His yard man brought it to his attentions and is worried that it could damage his lawn equipment.

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Tell him cut them down as he feels necessary

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Tell him cut them down as he feels necessary

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This. I understand the tree is on your property, but those knees are his problem. Tell him to have at them and call it a day.

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use a cordless sawzall on anything exposed above ground

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If we are talking about knees and more than a couple most people will regret using a reciprocating saw... DAMHIK

I use a battery-powered chainsaw I use for small jobs to cut knees off flush with the ground. I paint the exposed wood with Fertilome which seems to extend the cut times significantly (to maybe 4 years) and doesn't seem to have any effect on the trees themselves. I've been doing it for about 12 years on the back part of my camp property where I keep my boat trailer. I wouldn't really bother until they got pretty high but they will frick up a mower so I keep them at bay.

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If we are talking about knees and more than a couple most people will regret using a reciprocating saw... DAMHIK

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How do you know? (You’re not the boss of me!)