As I was spending time in the yard this weekend, I was thinking about some of the typical activities people associate with this time of year - and the first application of 'weed-killer' usually tops the list. 'Weed' is not a scientific classification, like tree, perennial, or grass, rather it is a cultural stereotype for plants growing in places you don't want them to.
Consider the dandelion - to the little girls and boys, it is the 'pretty yellow flower' they pick for their mothers.