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36 | OHCC LIVING | SEPTEMBER 2026 | The SMB Club and Garden Club recently enjoyed a trip to Roger's Gardens in Corona del Mar. While this beautiful nursery is known for its exceptional plants and displays, our main purpose was to hear a presentation on Monarch butterf lies by Ron Vanderhoff. Ron is the General Manager and Vice President of Roger's Gardens, a lifelong Southern California gardener, and a local director of the California Native Plant Society. He is deeply involved in Monarch conservation and personally participates in counts at overwintering sites throughout Orange County. His presentation was both educational and thought- provoking. Ron explained that Eastern Monarchs migrate to Mexico for the winter, while Western Monarchs traditionally overwinter along the California coast. During this period, they enter "reproductive diapause," a resting stage similar to hibernation. Much of his presentation focused on the dangers of Tropical Milkweed. Since our club began, we have encouraged members to plant only native milkweed, which is also the only milkweed used in our sanctuary. Tropical Milkweed is often attractive to gardeners because it has larger leaves, colorful f lowers, and is usually less expensive. However, because it does not naturally die back in the fall, it can harbor high levels of the OE parasite, which may harm Monarch eggs, caterpillars, and adult butterf lies. Its year-round availability may also encourage Monarchs to remain and breed in California instead of migrating. When migratory Monarchs come into contact with these resident, winter-breeding populations, they may be exposed to higher levels of disease and harmful pathogens. Ron also discussed raising caterpillars in cages. Although caging allows us to observe the Monarch life cycle, it can interfere with nature's ecological balance. Caterpillars are an important food source for birds, lizards, wasps, and other wildlife. As difficult as it may be to lose them to predators, this is part of the natural cycle. What Can You Do? Purchase only native milkweed that has not been treated with insecticides. Ask local nurseries to stop selling Tropical Milkweed and avoid raising Monarch caterpillars in cages. By making thoughtful choices, we can help protect Monarchs while preserving the natural balance of our gardens. Written by Rona Cole Save the monarch butterfly