If it's a weed we worry about it. (Maybe). If it's a herb we think of it as useful.
If it's an indigenous wildflower, however, it becomes even more pleasant to look at. Take the lovely oxalis pes caprae, for instance. As I searched the Net for information about this plant, I needed to click through dozens of pages of negativity about it before I came to this lovely shot of the delicate little plant growing where it should, looking lovely in its natural surroundings.
In my garden it's equally attractive but I'm trying to get rid of it, because it's so invasive that it stops other plants from flourishing.
The other plant that flourishes in my garden and out-competes my native grasses is panic veldt grass, also from South Africa.
But I guess it's a matter of give and take, because if I read the contents page of a book I brought home from a trip to South Africa, what do I see?
I see that our Australian plants are invading South Africa.
Weed, wildflower - once again the word we choose is determined by the circumstances surrounding the named object.