That’s actually something that varies from country to country.
the American style places commas and periods inside the quotation marks, even if they are not in the original material. British style (more sensibly) places unquoted periods and commas outside the quotation marks. For all other punctuation, the British and American styles are in agreement: unless the punctuation is part of the quoted material, it goes outside the quotation marks.
https://www.thepunctuationguide.com/british-versus-american-style.html
We absolutely have blackberries. In my neck of the woods, there’s apparently 2 species of blackberries, one of which is highly invasive. I was going for walks about a month ago, specifically routed to pass by as many wild blackberries as possible, and they were very delicious!