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I have a 17 year old huge mulberry tree in my backyard, about 29 ft from the house. Also it's close to the backyard drainage. Is that OK or could it harm the house foundation?

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How wide is the tree's canopy? In general, a tree's root system spans 1.5 times the tree's canopy, but even so, a large tree twenty-nine feet from a house should pose no damage to your foundation. I have two Norway maples on the "terrace" (hell-strip) less than that from my house and they've caused no issues to my house's foundation.

As for the drainage, it should help, rather than hinder, the draining of water from your property if the drainage area is within the tree's root zone because the roots will take up the water that percolates through the soil in that area. I would not worry about this tree.

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