Previous research has identified FT Plums as a space crop candidate, but more research on practical horticultural management is required to increase their technical readiness level (TRL) for spaceflight suitability. Given the ongoing shift towards indoor farming and further advancements in space agriculture, it is imperative to develop Controlled Environment Agriculture (CEA) methodologies tailored to woody species to facilitate further progression in the field. Here, we advance the terrestrial and spaceflight TRL of FT Plums by investigating far-red (FR) supplementation on fruit production. The results of this study will provide advancements in FT Plums TRL and provide insights for indoor tree cultivation for terrestrial and spaceflight applications.