Posted: 25/11/2012 at 16:20
That said Alliaria petiolata may regenerate from adventitious buds on the roots. These may sit doormant in the soil for up to 18 months until disturbed and thus regenerating. Often classed as Monocarpic perennials rather than biennials because the foliage can remain for more than two years before they flower. All this in mind I think an invasiveness of barely 1 is a little off the mark.