Resumo. Social wasps are essential components of ecosystems, acting as pollinators, predators of herbivorous insects, and bioindicators of environmental quality. Their nesting behavior is influenced by substrate availability, structural characteristics, thermal conditions, and predator avoidance. In urban areas, ornamental plants are widespread and may provide suitable microhabitats for wasp colonies, especially when combined with artificial supports such as pots. However, little is known about how these ornamental plant-pot systems influence nest site selection by social wasps. This study investigates the occurrence and nesting behavior of Mischocyttarus sp. in ornamental plants in a residential urban environment in southeastern Brazil. We evaluated plant architecture, substrate stability, and nest positioning to explore factors that may influence nesting decisions. Special attention was given to structural and microclimatic features, such as thermal regulation and camouflage potential, which could enhance colony establishment and survival in anthropized landscapes. By focusing on the interactions between wasps and common ornamental plants, this study offers insights into the behavioral plasticity of Mischocyttarus sp. and highlights the often-overlooked ecological role of urban vegetation. The findings contribute to a better understanding of insect adaptation to urban environments and raise important considerations for urban biodiversity conservation through landscaping choices.