All green thumbs, take note. This weekend at the Sacramento Convention Center, KOVR is sponsoring the California State Home & Garden show. The event will feature free seminars, guest speakers and workshops for those interested in home and garden improvement. The show opens Friday at noon and runs through Sunday evening, providing a wide range of resources and something for everyone. For composting enthusiasts, Lora Laskay of Magic Earth will be hosting "Composting for Kids" and "Urban Composting" seminars. "Urban Composting" will teach city dwellers how to adopt composting into their lives despite time and space constraints. Do-It-Yourself-ers should check out Erika Wallin, of Rocklin W