For more than a quarter-century, the Fresno Home & Garden Show's organizers have canvassed the Central Valley to collect and concentrate the knowledge of scores of building, décor, gardening, and landscaping professionals. As homeowners browse booths and, blueprints in hand, consult with vendors on planned projects, master gardeners talk about sustainability and vegetable gardening, and landscaping competitions determine which artists can construct the largest molehill-based mountain.