Sugi, Japan's national tree, shaped postwar landscape through massive afforestation but created monoculture forests now causing public health crises. One-quarter of Japan's population suffers allergies from the tree's prolific spring pollen.

Ayahuasca, an Amazonian psychoactive brew, served Indigenous communities for millennia in healing, spiritual initiation, and divination rituals. Loren Miller's 1986 patent on a cultivar was overturned not by recognizing Indigenous rights, but by a pressed plant specimen from a Chicago museum.

Black-eyed peas shifted from sacred African symbol to marker of low status in Europe, then became central to enslaved African American foodways and culture. Pliny the Elder warned priests against eating them, believing their rough nature would upset delicate constitutions.

Maize served as sacred sustenance and cultural cornerstone for Mesoamerican peoples, domesticated from teosinte nine thousand years ago. Guatemala's 2014 protests against seed-patenting laws unified Maya spiritual leaders, farmers, and activists defending maize's spiritual significance against corporate control.

Peanuts, a legume domesticated in South America over 7,000 years ago, became a global crop reshaping trade, agriculture, and cuisine across continents. The Moche civilization immortalized peanuts in gold necklaces and ritual ceramics, associating them with fertility and death due to their subterranean growth.

The Venus flytrap fascinated eighteenth-century naturalists through transatlantic specimen exchange networks, earning Linnaeus's declaration of "miracle of nature." Early naturalists misinterpreted the plant's trap mechanism as a catch-and-release device rather than a predatory killing system.

Tamarind sustained medicinal practices and cuisines across Africa, India, and beyond through its acidic pulp and drought-resistant growth. A Hindu legend claims the fruit falls unripe because the goddess Radha cursed it after cutting her foot on its bark while rushing to meet Krishna.

Amorphophallus titanum attracts crowds through its massive size and putrid odor during rare blooms occurring every five to ten years. Horticulturists have enabled three times more flowering in six years than occurred over the previous 120 years by sharing cultivation techniques between botanic gardens.

Contrayerva, a Nahua therapeutic called coanenepilli, became valued in European medicine through sixteenth-century accounts by explorers and naturalists like Clusius. The plant's indigenous name meant "serpent's tongue," yet European botanists linked it to multiple physically different plants all called coanenepilli.

Peony served medicinal purposes for over two millennia across Europe and Asia, treating epilepsy, gynecological ailments, and convulsions. An 18th-century Medici princess used peony roots in an infant convulsion powder to forge political alliances with European courts.

Watermelon evolved from a pale, medicinal fruit to a sweet dessert staple while accumulating complex cultural meanings across Africa, Asia, Europe, and America. Nineteenth-century racist stereotypes falsely linked watermelons to Black criminality and disease, transforming a symbol of freedom into a tool of racial oppression.

Sunflower (*Helianthus annuus*), domesticated in eastern North America, became a global crop and iconic subject in European art after its sixteenth-century introduction. Immature sunflowers track the sun through circadian growth rhythms, while mature plants face east to attract pollinators—contrary to long-held myths about perpetual heliotropism.