It gets complicated, but a mutation is a change in a gene or chromosomes that can be passed on through reproduction, but it is a rare event.
Cloning in plants can be achieved by budding onto rootstock for instance.
You can also get changes caused by virus in plants. Plants develop variegation as a result of viral infection, genetic mutation, or nutrient deficiency, with for instance Hostas virtually all variegation is caused by virus, in all variegated plants that have this type they will retain the variegation as long as the virus is present, weakening of the virus will show itself as the dominant original green returning, but that is only one reason for the change some variegation is also caused by mutation, that would be permanent as it involves a gene or chromosome changing, there are virtually no original species as far as I I know, with variegation.
I could go on but I see the eyelids drooping and the yawning starting, but it does get quite involved.