According to the National Gardening Association, 83 percent of U.S. households participated in lawn and garden activities last year. For some, gardening is more than just a hobby-it's a way to make a difference. With green thumbs and elbow grease, volunteers across the nation are growing food to feed the hungry, revitalizing crime-ridden areas, teaching children environmental stewardship and beautifying neighborhoods.

To reward them, The Scotts Miracle-Gro Company is seeking nominees for its seventh annual Scotts Give Back to Grow Awards, which will offer a total of $40,000 to the winners-$5,000 each to four first-place category winners and $2,500 to two additional finalists in each category.

"Gardens can transform communities, and the seeds of these transformations are often planted by volunteers," says Jim Hagedorn, chairman and CEO of ScottsMiracle-Gro. "The Awards recognize selfless heroes for their efforts to grow a better world."

Nominations are being accepted for these categories:

? Classroom Gardener of the Year-Salutes elementary through high school teachers who incorporate gardening into their curriculums.

? Urban Greenup Gardener of the Year-Salutes volunteers who use gardening to address the challenges of an inner-city neighborhood.

? Community Beautification Gardener of the Year-Salutes volunteers who demonstrate their commitment to environmental stewardship through beautification of a main street, park or neighborhood within their city limits.

? Good Neighbor Gardener of the Year-Salutes volunteers who help feed the hungry by growing produce for donation to food banks or participating in programs such as Plant a Row for the Hungry.

The winners of the sixth annual Awards included a middle school teacher whose students learned important life skills in their classroom garden; a community member who spearheaded the restoration of an abandoned, formerly segregated park; a generous gardener who led the donation of more than 16,000 pounds of fresh produce to the hungry; and a volunteer who established a program that improves quality of inner-city life through year-round organic food production.