Petunias and their close relative, Calibrachoa, are quite hardy. They are often sold alongside Pansies, and violas, in spring and early fall, as "cool season" annuals, because they can survive temps, in the upper teens, or lower, without being killed. They will often self seed, as well, and appear as perennials.
Likewise, Dianthus, and their close relative,, the carnation, are even hardier than petunias, and are often classed as biennial, or perennials. I have a type of Dianthus, known as Sweet William, in my garden, that returns every year. Sweet William flowers in late spring to early summer.
Actually, there are many non native plants, that self seed, in the US. Believe it or not, the dandelion was brought to the US, originally, as a food plant. Needless to say, even though the plant naturalized itself, over here, it has become an invasive weed, that many spend lots of money, each year, purchasing chemicals, to eradicate it, rather than use the plant as an edible.
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