Urban and peri-urban agriculture (UPA) operates in an ambiguous relation to rapid urban growth. While urban expansion constrains farmers' access to land and resources, resulting in a replacement of UPA, proximity to expanding urban economies creates new market opportunities leading to enduring UPA. While the literature on UPA in the Global South is burgeoning, little attention has been paid to market-oriented forms of UPA under rapid urban growth. In this paper, we analyse the spatiotemporal dynamics of UPA and market-oriented farmer's responses to changing socio-spatial circumstances in two rapidly growing Kenyan cities: Nyeri and Nakuru. By conceptualizing UPA's enduring existence as continuity under change, we develop a spatiotemporal understanding of market-oriented UPA that goes beyond a dominant dichotomous view on replacement versus persistence. Based on a mixed-methods approach combining geospatial analysis with quantitative and qualitative interviews, our findings show that the continued existence of market-oriented agriculture in the city is connected to highly dynamic processes of commercialization, specialization, and intensification. We conclude that market-oriented farmers are not inevitably pushed out of the city, but rather that they are – under certain conditions – able to actively respond to the pressures as well as opportunities that emerge during rapid urban growth.

城市和城郊农业 (UPA) 的运作与城市快速增长的关系不明确。虽然城市扩张限制了农民获得土地和资源的机会，导致 UPA 被取代，但靠近不断扩张的城市经济创造了新的市场机会，从而使 UPA 持久化。虽然全球南方关于 UPA 的文献正在蓬勃发展，但在城市快速增长下以市场为导向的 UPA 形式却鲜有关注。在本文中，我们分析了肯尼亚两个快速发展城市 Nyeri 和 Nakuru 中 UPA 的时空动态以及以市场为导向的农民对不断变化的社会空间环境的反应。通过将 UPA 的持久存在概念化为变化下的连续性，我们发展了一种时空理解以市场为导向的 UPA 超越了关于替代与持久性的主要二分法观点。基于将地理空间分析与定量和定性访谈相结合的混合方法，我们的研究结果表明，该市以市场为导向的农业的持续存在与高度动态的商业化、专业化和集约化过程有关。我们得出的结论是，以市场为导向的农民并非不可避免地被赶出城市，而是在特定条件下，他们能够积极应对城市快速发展过程中出现的压力和机遇。