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Q&A

A Tree Grows in — Well, You Don’t Want to Know

Fruit on trees grown near outhouses and latrines usually is safe. That’s not true of produce found on the ground in the same areas.

Credit...Victoria Roberts

A. Maybe not. The tree would not have carried any disease-causing microbes from root to fruit. People have long planted fruit trees where outhouses used to be and eaten the fruit without apparent harm.

But only the fruit picked from the tree should be eaten, not fallen fruit.

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Some fruit trees can even be safely planted beside an active, properly maintained outhouse, in which human waste is mixed with dirt and ash — a sanitation system that is spreading in parts of Africa.

Ground-growing vegetables and fruits, obviously, should not be planted near a latrine. And septic fields and systems with septic tanks are risky settings for trees, too — chiefly because thirsty tree roots may invade the system, clogging or otherwise damaging it.

There is also the possibility that dust or evaporating surface water will carry pathogens from a leaking septic field to tree fruit. Experts advise using ground cover to minimize the problem, and washing the fruit meticulously.

A version of this article appears in print on  , Section D, Page 3 of the New York edition with the headline: A Tree Grows In . . .. Order Reprints | Today’s Paper | Subscribe

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