When Callie Zamzow’s great-grandfather accidentally stepped off a train in Meridian to grab a sandwich and couldn’t get back on, he couldn’t have known he was planting the seeds for what would become one of Idaho’s most beloved family businesses. Now, 92 years later, Zamzows operates 12 locations throughout the Boise Valley, combining scientific innovation with a deep commitment to community values.
The company’s origin story feels almost mythical – two brothers stowing away on a train headed for California, one brother missing the departing train after buying a sandwich, and subsequently deciding to make Idaho his home. That seemingly minor stroke of fate during the Great Depression laid the foundation for a business that would grow from humble beginnings into a household name. In 1933, Callie’s great-grandparents purchased what was then known as the Snotgrass Mill, which still operates today as the original Zamzows location on Fairview Avenue.
The early days were defined by hard work and innovation born of necessity. For 20 years, Callie’s great-grandparents mixed animal feed on the ground with shovels before bagging it up, with her grandmother hand-sewing each bag. This commitment to quality and craftsmanship, even when resources were limited, established a cultural foundation that continues to define the company nearly a century later.
Jim Zamzow, Callie’s father, brought scientific passion to the family business. Described by Callie as a “mad scientist,” Jim’s fascination with soil health and plant nutrition drove product development in entirely new directions. What makes Zamzows unique is how they’ve created hundreds of products based on Jim’s scientific explorations. His background in biology and his natural curiosity about how nutrients interact with soil microbes created an innovation engine that constantly produces new solutions for gardeners and farmers.
Today, Zamzows stands as a diverse business that encompasses fertilizer production, feed manufacturing, retail garden centers, home goods, and even exotic pets through their “Zamzoo” sections. Their custom-formulated products, like the popular “Tomato Boom,” reflect their commitment to soil health and sustainable practices. Callie explained their philosophy: even seemingly harmless chemical fertilizers disrupt the beneficial microbes in soil, which ultimately impacts plant health and productivity. This science-based approach to gardening has created loyal customers who appreciate both the effectiveness and the ethos behind Zamzows products.
Callie co-leads the business with her brother as Co-CEOs, a unique arrangement that requires exceptional communication and clarity. After initially resisting joining the family business – she spent years trying to establish her own path, including attempts at veterinary school and a stint at Merrill Lynch – Callie found that everything “clicked” when she finally embraced her family legacy. Twenty-five years later, she recognizes that finding her own authentic leadership style within the established family framework was key to her success and happiness.
Perhaps most impressive about Zamzows is their workplace culture. With approximately 200 employees during peak season, they’ve managed to create an environment where team members feel engaged, valued, and genuinely enthusiastic about their work. Callie attributes this to recruiting people who already share their values and passion for plants, animals, and sustainability. This natural alignment creates a foundation for developing expertise and a sense of community among employees.
As Zamzows approaches its centennial, they’re continuing to innovate. A new podcast called “Nobody Knows with a Z” will replace their longtime Saturday morning radio show, adapting to changing media consumption while maintaining their commitment to sharing practical gardening wisdom with the community. Through four generations of family leadership, Zamzows has demonstrated that businesses can maintain their core values while evolving to meet new challenges – a lesson in sustainability that extends far beyond their garden products.
