Will mushrooms absorb fluoride from the soil?

Asked September 1, 2020, 11:15 AM EDT

I'd like to start growing shiitakes and other edible mushrooms. I read online that used coffee grounds are a good medium to grow on. My concern is the added fluoride in city water used to brew the coffee. I have read that mushrooms can absorb heavy metals, fluoride isn't a metal but i still don't want to consume it.

Hillsborough County Florida

1 Response

Hi, you mentioned that you read online to grow mushrooms in coffee grounds but mushrooms naturally grow on wood.

Here is a link to our bulletin D.I.Y. FunGuide: Grow Your Own Mushrooms at Home https://edis.ifas.ufl.edu/pdffiles/SS/SS66200.pdf . We also have another website with information on Growing Mushrooms at Home at this link https://gardeningsolutions.ifas.ufl.edu/plants/edibles/vegetables/growing-mushrooms-at-home.html

I did a number of internet searches concerning your original question about mushrooms absorbing fluoride from your city water. I couldn't find any information on that exact question, but I did find that coffee beans contain fluoride and mushrooms contain a lot of water, so I can't say that the mushrooms won't absorb additional fluoride from your city water. You could get around that issue by watering your mushrooms with distilled water, which is fluoride free.

I hope this information helps you on your quest to grow your own mushrooms!