10). The weeds provide shade, support, and cushioning for the vegetables after gardening fever cools. — David Ruff and many others

9). Weeds are like gray hair: if you pull one, two will come back. — Barb Hunter and a gob of others

8). It's the only thing that's ACTUALLY growing there. — Ron Bopp and a passel of others

7). Strategic diversionary tactics to keep the rabbits away from the lettuce. — Chickadee and more

6). Eco reasons: Let them be. If I weed, I breathe more heavily, thus creating more CO2 and accelerating the greenhouse effect. By not weeding, I'm letting the weeds breakdown CO2, thereby counteracting the greenhouse effect. "Weed less for our children's future!" — Pete Ettridge

5). Weeding causes erosion. Erosion causes flooding. Flooding causes damage. Dammage causes higher insurance rates. Higher rates cause stress. Stress causes heart disease. Heart disease is nothing to mess with. Nope, I'm not risking it! — Randy Johnson

4). So the moose and elk hiding there won't get angry. — mike

3).Zen gardening: Letting the garden choose it's own path. — SamuraiCat & StormLady

2). Neighbor's kid depends on the income. — Ken Barrett

1). Because your cute craft-fair-purchased garden sign reads, "This is not the Garden of Weed'n". — campgehman