In this episode of Grown in Napa Valley, guest host Jonathan Cristaldi presents highlights from the 2025 Napa Valley Harvest Press Conference, presented by the Napa Valley Grapegrowers and Napa Valley Vintners,  joined by growers and winemakers Ashton Leutner, Mayan Koschitzky, Nate Weis, and Megan Gunderson. They unpack a cooler, steady 2025 growing season shaped by early rains, slow canopy development, minimal heat spikes, and strong fruit set. With phenolic ripeness outpacing sugar accumulation, the panel notes vibrant color, natural acidity, and balanced alcohol across the vintage.

They discuss the year’s key challenges — elevated mildew pressure and a stop-and-start harvest caused by intermittent rain — and share how tight spray intervals, sport-trap monitoring, and thoughtful canopy work helped maintain fruit quality. Market shifts also left some fruit unharvested, creating an opening for growers to redevelop vineyards, adjust crop loads, and focus on long-term soil and plant health.

The conversation turns to the Pickett Fire, which produced highly localized smoke impacts. Thanks to improved air-quality tools and advanced ETS smoke-taint testing, growers were able to assess risk with far more precision than in past fire years. Early takeaways from the panel point to a distinctive, expressive 2025 vintage — wines with strong color, refined tannins, and clear AVA character — underscoring a maturing Napa Valley rooted in adaptation, stewardship, and continuous learning.

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In this episode of Trellis Talks, Caleb Mosley sits down with soil scientists Dr. Paul Anamosa and Dr. Nick Madden to explore their 2023 paper, “The Other White Rock in Coombsville Vineyards.” The conversation unpacks the geological mystery and viticultural significance of diatomaceous earth found in the Coombsville AVA—a lightweight, silica-rich sediment formed from freshwater algae in an ancient caldera lake. Anamosa and Madden discuss how these unique soils, often mistaken for volcanic ash or bentonite, impact vine growth, emphasizing their low pH, high aluminum toxicity, and unusual water retention characteristics. They explain how proper soil analysis and management—particularly the use of gypsum and lime—are crucial for successful vine development in these challenging conditions.

The episode also delves into the broader story behind their collaboration, from international development work to building one of Napa’s most extensive soil pit databases. As Paul transitions into retirement, he reflects on the importance of mentorship and passing on deep technical knowledge to the next generation of consultants like Nick and their colleague Scott Nippelmeyer. Their combined efforts promise a new era of viticulture grounded in science, innovation, and deep respect for Napa Valley’s complex terroir.

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In this episode of Grown in Napa Valley, host Caleb Mosley speaks with CAL FIRE’s Matt Ryan and JC Greenberg about the recent Pickett Fire in Calistoga and the evolution of wildfire management in Napa County. They recount how lessons learned from past disasters like the Glass Fire informed a faster, more coordinated response, aided by years of fuel reduction, maintained containment lines, and collaboration with Napa Firewise. New technology—including AI-enabled smoke detection, night-flying helicopters, and mobile retardant bases—has revolutionized early fire response. The chiefs emphasize that resilience depends on community-wide preparedness: defensible space, pre-fire planning, and responsible vineyard burn practices to prevent smoke impacts during harvest.

The conversation then turns to Bill Hanna, Napa Valley Grapegrowers’ first Lifetime Achievement Award recipient, who reflects on his family’s 50-year partnership with Château Montelena and their deep roots in Napa farming. Hanna shares how trust, quality, and collaboration have sustained this grower–winery relationship across generations. Beyond the vineyard, he highlights decades of advocacy for farmworker housing and community well-being, noting Napa’s leadership as the only county where growers self-assess to fund workforce housing. Looking ahead, Hanna discusses the need for balance—between groundwater use, vineyard density, pricing, and long-term environmental stewardship—underscoring education and cooperation as the keys to Napa Valley’s enduring agricultural legacy.

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In this episode of Grown in Napa Valley, host Caleb Mosley first speaks with Julien Dumercq of IVES (International Viticulture and Enology Society), who highlights the organization’s mission to provide open-access research in viticulture and enology. Julien explains how IVES grew from a small initiative in Bordeaux into a global network of 35 universities and research institutes, supported by members and partners including several Napa Valley wineries. Their peer-reviewed journals, multilingual technical reviews, and international conferences foster collaboration and innovation, ensuring that research is widely available and free from financial barriers. Julien emphasizes the importance of building community across continents, sharing best practices, and maintaining scientific integrity while adapting to new technologies like AI.

The conversation then turns to the U.S. with Randy Heinzen of Vineyard Professional Services and Donnell Brown of the National Grape Research Alliance (NGRA). Randy shares his journey from Napa to Paso Robles and his experiences farming across diverse sites, underscoring the value of research and cost-based vineyard management. Donnell explains NGRA’s national role in setting research priorities for all grape sectors—wine, juice, table, and raisins—and in advocating for projects with USDA and funding agencies. Together, they stress the importance of collaboration, sustained investment in research, and engaging the next generation of leaders to address challenges such as climate change, pests, and shifting market dynamics. The episode highlights Napa Valley’s role in both global and national research efforts, bridging science and practice to support resilient grape growing.

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In this episode of Grown in Napa Valley, host Caleb Mosley sits down with two local leaders to explore how deep-rooted community values and agricultural resilience shape Napa Valley. First, Terence Mulligan, President and CEO of the Napa Valley Community Foundation, discusses how the foundation serves as a platform for strategic philanthropy, especially in times of crisis. He highlights initiatives like the Napa Valley Community Disaster Relief Fund and the One Napa Valley Initiative, which have helped thousands of residents—particularly undocumented families—through disaster recovery and access to citizenship. Mulligan emphasizes the importance of community trust, the power of pooling resources, and the unique generosity of Napa Valley donors in supporting long-term solutions.

The second half features Kendall Hoxsey-Onysko, co-chair of Harvest STOMP, President of Yount Mill Vineyards, and a fifth-generation grape grower. She reflects on her family’s multigenerational commitment to viticulture, organic farming, and business innovation. Kendall shares her journey from compliance work to managing vineyard sales and growing the family business, while also serving on influential industry boards. She speaks candidly about balancing motherhood, leadership, and legacy, and underscores the importance of Harvest STOMP as a fundraiser rooted in community care. Her message is clear: to preserve Napa Valley's future, growers must lead with collaboration, gratitude, and a deep respect for the land and the people who tend it. Participate in the Harvest STOMP eAuction from August 16 - 22, 2025!

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In this episode of Grown in Napa Valley, NVG tackles the economic headwinds facing the wine industry through an in-depth conversation with wine economist Dr. Chris Bitter of Terrain. Bitter breaks down the latest insights from Winescape, Terrain’s quarterly market report, revealing a shift in U.S. alcohol consumption trends. He explains how demographic changes, evolving health attitudes, and a rise in cannabis and GLP-1 drug usage are contributing to a measurable decline in per capita alcohol use—particularly among younger consumers. While all beverage categories are impacted, Bitter notes that wine is facing steeper challenges, with premium pricing and oversupply adding to the pressure. Still, he emphasizes Napa Valley’s long-term strength, citing its reputation for quality as a key advantage in weathering this downturn.

Later in the episode, Caleb shares a glass of 2016 Heimark Vineyard Napa Valley Cabernet Sauvignon with veteran vineyard manager Mike Wolf, in a conversation that spans mentorship, humility, and the philosophy of farming. From early lessons learned under the guidance of instinctive farmers in Mendocino to decades spent managing top-tier vineyards in Napa, Wolf reflects on the value of hands-on experience and the importance of staying true to the land. He speaks candidly about the tension between aesthetics and economics, and the quiet pride that comes from getting the work done right—often before anyone notices. Through stories of resilience, collaboration, and a commitment to the next generation of farmworkers, Wolf embodies the spirit of Napa Valley viticulture: rooted in history, shaped by community, and always looking ahead.

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In this episode of Trellis Talks, Caleb Mosley sits down with Dr. James Stamp, founder of Stamp Associates Viticulture and a leading expert on grapevine nursery quality. They discuss the evolving challenges and opportunities in grapevine plant material, including the impacts of nursery consolidation, vineyard fallowing, and the persistent threat of red blotch disease. Dr. Stamp emphasizes the critical importance of starting with clean, high-quality plant material and the need for improved nursery practices, including the potential for greenhouse-grown propagation and new technologies to enhance plant health and vineyard success.

The conversation also touches on the decline of two major nurseries, Duarte and Wonderful, and what that means for future vine availability. Dr. Stamp shares insights on alternatives like green grafting, Uber vines, and the importance of collaboration among growers to address vineyard replanting and virus management. Despite current challenges, both Stamp and Mosley express optimism that this transitional period presents an opportunity to elevate the standards and innovation within the grapevine nursery sector, ultimately strengthening the foundation of Napa Valley vineyards.

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In this special episode of Grown in Napa Valley, host Caleb Mosley visits Ridge Monte Bello to sit down with two influential voices in California wine: Paul Draper and David Gates. Draper reflects on the collaborative tasting culture and experimental spirit that defined his winemaking career, including Napa’s role in his legendary 1971 Eisele Vineyard Cabernet. Gates shares insights on mountain viticulture, Napa's evolution in the 1980s, and the long-term conservation efforts that helped preserve agriculture on Monte Bello Ridge. Together, their stories highlight the enduring power of mentorship, land stewardship, and wines of place. 

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In this episode of Trellis Talks, host Caleb Mosley reconnects with phenolics researcher James Campbell, now based in Napa Valley and leading a lab focused on vineyard and wine phenolic analysis. Their conversation explores the science behind phenolic development in wine grapes, from early-stage flavonol formation to anthocyanin synthesis and degradation. James emphasizes the importance of early-season practices—like precise leafing and light management—and shares findings from multi-year studies on the effects of heat and irrigation on phenolic preservation. One key insight is that applying moderate irrigation during mid-ripening heat waves can mitigate anthocyanin loss, but late-season interventions are often too late to make a difference.

The discussion also touches on the nuanced interplay of variety, environment, and stress, noting that different grape cultivars respond uniquely to heat. James shares that Cabernet Sauvignon shows higher resilience compared to varieties like Sangiovese. The episode concludes with a look into James’s new venture, Integrated Phenolics, which offers rapid, in-depth phenolic assays for growers and winemakers. His goal is to equip producers with actionable data to make informed decisions during maceration and fermentation, ultimately supporting the continued excellence of Napa Valley wines in a changing climate.

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In this episode of Grown in Napa Valley, NVG celebrates its 50th Anniversary by honoring two influential figures who shaped—and continue to shape—Napa Valley’s viticultural legacy. The episode begins with a rich conversation with Andy Beckstoffer, one of NVG’s founders, who shares the story behind the organization's creation and the pivotal moments that helped elevate grape growers from second-class status to key decision-makers in the wine industry. From advocating for the 75% appellation rule to establishing vineyard-designate branding, Beckstoffer reflects on the early battles for grower respect, the transition from commodity farming to quality-driven practices, and how the region found confidence in its own identity following the 1976 Judgment of Paris.

Then, we share a glass with the 2025 Grower of the Year Oscar Renteria, who reflects on his upbringing in a multi-generational farmworker family and his journey toward leading Renteria Vineyard Management. Oscar speaks with heartfelt optimism about resilience, legacy, and mentorship, emphasizing the importance of education, cultural pride, and finding joy in hard work. His leadership style—rooted in gratitude, empathy, and teamwork—embodies NVG’s mission and offers a forward-looking perspective for the next generation of Napa growers navigating uncertain times with hope and purpose.

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