Abstract: Plant space conceptualized as a design language transcends its conventional role of mere beautification in landscape architecture, emerging as a pivotal tool for shaping spatial experiences and conveying the essence of design intentions. The synergy between the physical attributes of plants and their seasonal transformations contributes to a rich tapestry of plant-spatial lexicon. Through meticulous configuration, this lexicon facilitates the creation of spaces that range from open and public to private, directive, or immersive, thereby catering to diverse functional demands and aesthetic preferences. This research underscores the significance of integrating plant characteristics harmoniously with spatial perception in plant space design. By comprehensively assessing factors such as plant size, morphology, color, texture, and phenological variation, as well as the combination layout on the ground plane, vertical plane, and top plane, rich spatial forms such as open, semi open, covered, closed, and vertical are created, presenting diverse spatial perception experiences such as open, private, solemn, dignified, peaceful, inclusive, guiding, or immersive. This achieves multi-level expression and emotional resonance of plant landscape space, thereby enhancing the overall quality and humanistic care of garden landscape, and providing scientific guidance for space creation for plant landscape design.