Home gardens are often the most agrobiodiverse sites in the anthropogenic environment, a space where crops and other useful plants are often transplanted from other components of the landscape. This study investigates the plant composition of home gardens and their usefulness in 12 small towns and villages-with three of these chosen as the focus for in-depth research-situated in the Jeju province of South Korea. The goal of the research is to explore their roles in local ethnobotany in the context of habitat conversion and land use change. The 131 home gardens surveyed in these villages yielded 164 species-and variety-level plant taxa (52 wild, 109 domesticated, and 3 introduced), of which 95 were useful plant taxa (39 wild, 55 domesticated, and 1 introduced). Use of home garden plants was predominantly for food and medicinal purposes. Home garden plant usefulness was more multi-functional and thus more versatile than practices associated with these plants in nongarden habitats. Plant diversity in home gardens was supported by the presence of nearby forest and grassland areas. Interview data indicate that plant users were motivated to transplant wild plants into their home gardens in order to secure a consistent supply, given decreases in wild plant populations in the last 15-20 years. The loss and overharvesting of forests and other wild plant habitats have caused the decrease in these plant populations. Underlying drivers of the habitat conversion and land use change influencing increased wild plant transplants to home gardens are local livelihood and lifestyle changes, including the earlier expansion of commercial agriculture beginning in the late 1960s and the accelerated growth of tourism since 2000.

The South Korean government's historical efforts to introduce improved crop varieties have been ambiguously successful. State-bred rice varieties helped achieve national food production goals during the Green Revolution of the 1970s, but these varieties were highly unpopular and were abandoned soon, as the government stopped promoting them. This paper contrasts that experience with the simultaneous successful introduction of an improved variety of tangerine (Citrus unshiu) as a cash crop in Jeju Province. Smallholders of Jeju found space for the high-return fruit in the existing land use system, including the partial conservation of agrobiodiversity without critically risking their subsistence-based food security. Citrus in general was a spatially lessdemanding crop that farmers could partly co-cultivate with subsistence crops, while state-bred rice varieties occupied farmland exclusive of other varieties and rice's double crops. Additionally, by employing political ecology, this paper asserts that the different roles of the state in introducing the two crops and the different regions were other factors behind such divergent adoption outcomes. Considering rice, the state was highly interventionist, because the government depended on rice-producing regions to "feed the nation"; with regard to non-staple-crop production in low-productivity, hard-to-develop regions like Jeju, in contrast, the government gave farmers more autonomy, thus allowing farmers to determine their own space and pace for citrus adoption. The study critically investigates the variable of spatial compatibility between a crop and the land system and sheds light on the current development mission to harmonize the cultivation of food and cash crops.

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