When is a weed not a weed?

Science for Life. 365

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A ScienceforLife.365 guest post by Dr Heather Bray* 

Heather: My garden needed a darn good weeding this morning. I spent a couple of hours on it, furiously pulling up or digging out the offenders, being careful not to disturb the plants I have nurtured since before the summer..

When it came to this little fellow however, I left him alone. I decided this one wasn’t a weed.

The best definition for a weed is the first one I learned in Year 7 Agriculture:

A weed is a plant in the wrong place.

We decide which plants are in the right place and which ones aren’t based on a whole range of factors; many of the reasons are based in science, but some are not. Some plants are dangerous and so we consider them weeds because they are toxic to humans or animals. Some weeds can affect nearby plants through competition…

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