I was thumbing through a gardening supplies catalog, looking at the assortment of “things you can spend your money on that your plants will probably do fine without” when my eye was caught by an offer for “mycorrhizae.” The catalog was extolling the many virtues of this fungal spore mix—it would improve plant health, make the plants more drought resistant, increase yields, protect against diseases, reduce the need for fertilizer, and cure my great-aunt’s bunions, all for $16.95 per pound.

It sounded too good to be true, so naturally I was highly skeptical. (It also sounded pretty expensive until I learned that you apply it by the teaspoon. Phew, not so pricey after all!)

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