Plant photo

Plant photo

Observation - Plant photo - Southern Africa. Description: This plant is growing in my garden and apparently it is illegal? I thought it was a nice plant that started growing. Please advise what it is, where it comes from and why it would be illegal?

This plant is growing in my garden and apparently it is illegal? I thought it was a nice plant that started growing.

Please advise what it is, where it comes from and why it would be illegal?