Nearly every peppermint plant you'll ever meet is a clone. Peppermint is a sterile hybrid that barely sets seed — it doesn't need pollinators, and bees have nothing to do with peppermint oil yields, despite what you'll often read. But wild bees work mint flowers relentlessly anyway. This episode untangles what peppermint actually owes to bees, and why garden mint is one of the best mid-summer nectar sources you can grow for native bees.

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Peppermint origin, sterility, propagation

• Vining, K. J., et al. (2024). Genome structure of hexaploid 'Black Mitcham' peppermint (Mentha × piperita L.). — sterile allohexaploid, male-sterile, clonally propagated.
• Murray, M. J., Lincoln, D. E., & Marble, P. M. (1972). Oil composition of Mentha aquatica × M. spicata F1 hybrids in relation to the origin of M. × piperita. Canadian Journal of Genetics and Cytology, 14(1), 13–29.
• Seed-set figure (18,000 floral spikes / >2.75 million ovules / 6 viable seeds) as reported in the peppermint in vitro clonal propagation literature — verify against the primary source cited therein before air.
• Lawrence, B. M. (ed.) (2006). Mint: The Genus Mentha. CRC Press.
• Mint Genomics Resource, Lange Laboratory, Washington State University. langelabtools.wsu.edu/mgr

Oil biosynthesis and trichomes

• Croteau, R. B., Davis, E. M., Ringer, K. L., & Wildung, M. R. (2005). Menthol biosynthesis and molecular genetics. Naturwissenschaften, 92(12), 562–577.
• Turner, G. W., Gershenzon, J., & Croteau, R. B. (2000). Development of peltate glandular trichomes of peppermint. Plant Physiology, 124(2), 665–680.

Mint attractiveness to pollinators

• Garbuzov, M., & Ratnieks, F. L. W. (2014). Quantifying variation among garden plants in attractiveness to bees and other flower-visiting insects. Functional Ecology, 28(2), 364–374. DOI: 10.1111/1365-2435.12178
• Rollings, R., & Goulson, D. (2019). Quantifying the attractiveness of garden flowers for pollinators. Journal of Insect Conservation, 23, 803–817. DOI: 10.1007/s10841-019-00177-3
• Nichols, R. N., Goulson, D., & Holland, J. M. (2019). The best wildflowers for wild bees. Journal of Insect Conservation, 23, 819–830.

Mid-summer forage gaps

• Timberlake, T. P., Vaughan, I. P., & Memmott, J. (2019). Phenology of farmland floral resources reveals seasonal gaps in nectar availability for bumblebees. Journal of Applied Ecology, 56(7), 1585–1596. DOI: 10.1111/1365-2664.13403

Bee natural history

• Rehan, S. M., & Richards, M. H. (2010). Nesting biology and subsociality in Ceratina calcarata. The Canadian Entomologist, 142(1), 65–74.
• Michener, C. D. (2007). The Bees of the World, 2nd ed. Johns Hopkins University Press.
• Wilson, J. S., & Carril, O. M. (2016). The Bees in Your Backyard. Princeton University Press.

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