When we think of weeds, often what comes to mind are small, quick-growing plants such as the dandelions or couch grass we might find in our gardens. You may not think of trees as being weedy.
But trees can be weeds too. They can spread quickly, showering an area in seeds and pushing out other species. Even species native to Australia can be a problem when they’re introduced to other areas.
It’s worth knowing the most common weedy trees so you can avoid planting them – or take them out before they get large and expensive to remove.
Weed is just a plant you don’t like. I’d prefer half the “weeds” that grow vs people concreting everything and wondering why everything is flooding
Well, from an arboricultural point of view, a weed species is one that out performs the local indigenous species. This then alters the balance between flora and fauna, and can eventually throw off ecosystem balance leaving to eradication of species from the local population. But yes, in a controlled back yard/front yard situation, it’s a bit different.
I work in invasive weeds instead of arboriculture now. That’s a nice thought and most fit the definition but some are beyond those simple expectations like @calhoon2005@aussie.zone says.