Summary: With the development of new varieties and rootstocks, numerous challenges emerge before achieving enhanced growing practices. With over 20 million WA 38 plants, growers face various unanswered questions. The Roza WA38 block, established in 2013 at the Washington State University Irrigated Agriculture Research and Extension Center in Prosser, serves as a unique research and extension hub in the heart of the Yakima Valley. The planting design has three training systems; vertical spindle at 1210 trees per acre, V trellis at 2420 trees per acre and a vertical wall bi-axis at 1210 trees per acre, and two rootstocks; G 41 and M-9 Nic 29, arranged in a randomized design, creating a distinctive experimental setting for targeted inquiries and validation. The project objectives were to 1. Evaluate horticultural practices on WA 38 grown on G41 and M9-Nic 29 for better production and fruit quality and 2. Utilize the WA 38 Roza farm as a demonstration block for community engagement and outreach. Keywords: Cosmic crisp, vigor, green spot, supplemental pollen
