Indigenous and non-indigenous plants?

Yes, weeds are everywhere. If you are talking about "weed" or "pot", then, yes you can find it wild all over the world.

No.

Indigenous plants are plants that are native to a region or a country, while exotic plants are those that have been introduced into the country/ region in recent time by people colonising or moving...

When we say that a species is indigenousto a place, we mean simply that it occurs there naturally. It is a native. But a species can be indigenous to a number of places at once. In contrast, if we...

A Pine Tree is one indigenous plant in South Africa