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Botanic Garden > Question and Answer > About Gardening > Hydrangea – Damage Nearby Pipes

Hydrangea – Damage Nearby Pipes

2016/8/15 14:39:26

Q: I recently planted a hydrangea bush next to my house. When I was digging the hole I found a gas pipe and an irrigation pipe directly underneath. Do I need to worry about the roots damaging these lines as the hydrangea grows?

A: A plant root can't tell the difference between a water pipe and a rock. The only reason a plant root might invade a pipe is if it leaks water. That's not likely with an irrigation supply pipe but might be possible with a sewage drain pipe. Your hydrangea roots won't hurt the pipes you found. On the other hand, a tree planted over pipes might damage them due to the tree's roots swelling and gradually bending the pipe.

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