What is the definition of a weed? I maintain a large property in addition to writing blog posts. My job is to keep the exterior looking immaculate. This includes mowing large areas, running the 'weed' eater, and maintaining the gardens. After watching the ebb and flow of plant growth, I began to wonder what is the definition of a weed? Read on to find out more about weeds. Weeds can cause a lot of harm. As a result, it’s actually a pretty expansive topic. I guess I should have known that we are in the weeds about weeds.

Definition of a Weed

I bet you didn’t know that there is an organization called the Weed Society of America. This is a go to resource for weeds. According to their website, there is a list of 3756 types of weeds. The Almanac uses information from the Weed Society of America to provide 3 specific definitions of weeds.

First, there are plain old weeds. These are defined as any plant that grows where it is not supposed to. This is a common characteristic across several resources. They specify further that the plant causes economic losses or ecological damages. In addition to this, it can cause health problems for animals or humans.

Second, there are noxious weeds. These are identified by government officials (federal, state, or local). These plants specifically cause harm or are injurious. This means that different states can have different lists of noxious weeds.

Finally, there are invasive weeds. I’ve written about invasive plants many times. Thistle  is a common invasive plant that is considered a weed. These plants share characteristics with other invasive species such as lack of competition for growth or the ability to crowd out native species, prolific reproduction, and the ability to alter the ecosystem.

Crabgrass: The Ultimate Weed

Crabgrass is the ultimate definition of a weed. I have a love / hate relationship with crabgrass. However, in the end, I think that I love crabgrass more. It literally grows like a weed. As a result, it is hard to contain, however, in the right spot, it has some redeeming qualities. First, it grows thick. Second, the leaves are substantial. Consequently, it takes a lot of abuse and still looks good. Finally, it stays green when lots of other grass type plants don't. In a contained area, I rather like it! In the end, I'm not sure that I agree with the experts on which plants are weeds. I think it ultimately depends on the situation which plants fit the definition of a weed.