As the population of the world increases and cities grow in size, we are faced with remarkable societal problems regarding sustainable food security for the generations to come. In this paper, I present and discuss HAVE (Hydroponic Agricultural Vertical Environment), a research-through-design project that explores the design of an interactive open-source vertical kitchen garden. HAVE is designed as a shareable platform, that aims to lower the barriers of entry of getting started with home gardening, to provide an option for people to play an active role in working towards a more sustainable, resilient society. By simplifying the design of a computer-assisted garden, I present an engaging interactive system that is cheap and easy to build and maintain. With HAVE as a case study, this project also aims to expand upon how plant-based interfaces can be implemented in future design work, and builds upon the topics of calm technology and material computing. As such, this paper discusses the opportunities and challenges of designing plant-based interfaces, also in relation to how people care for and interact with plants. It is my hope, that HAVE may act as a conversation piece that addresses societal challenges regarding future agriculture practices, while contributing to the academic discussion and debate on the topics of plant-based interfaces, design for social innovation, and tangible computing, and the field of interaction design in general.