Most of the peppermint oil sold today comes from a variety of mint that was created with thermal neutron irradiation in 1971. In Texas, a type of grapefruit known as "Rio Star" accounts for roughly 75% of total grapefruit production. It was produced by a similar process and is desired because of its vibrantly-red flesh.
Similarly, about half of the rice grown in California is of a type called Calrose 76, also a product of radio-active experimentation. In fact, over 2,000 mutant crops are officially registered all over the world which were produced by intentional irradiation. Event today, the IAEA (International Atomic Energy Agency), the UN's "Food & Agriculture Organization", and Japan's "Institute of Radiation Breeding" all still experiment with atomic gardening.
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The mere fact that science may not yet adequately explain an object, event, or experience does not mean the immediate explanation should automatically default to a conspiratorial, extraterrestrial, paranormal, or supernatural cause.