Weed is any plant growing where it isn't wanted. In a garden, a dandelion might be a weed because it competes with the vegetables or flowers you're trying to grow. But in a meadow, that same dandelion isn't a weed at all, it's just part of the landscape. What makes something a weed isn't the plant itself, but where it's growing.

Some weeds spread incredibly fast, crowding out other plants and stealing water, sunlight, and nutrients from the soil. Crabgrass invades lawns. Kudzu vines can cover entire trees in the South. Bindweed wraps around garden plants and chokes them.

Gardeners spend considerable time weeding, which means pulling out unwanted plants. Some people use tools like hoes to cut weeds at ground level, while others prefer pulling them up by the roots so they won't grow back.

The word appears in phrases too. Someone might call television mental weeds if they think it crowds out more valuable activities. When you weed out weak ideas from a project, you're removing what doesn't belong, just like pulling dandelions from a flower bed.

Interestingly, some plants we call weeds can be useful. Dandelion leaves make salad, and their roots can be roasted for tea. One person's weed might be another person's treasure.