I publish articles every Monday (cycling), Wednesday (user experience) and Friday (pragmatic environmentalism). Other days I might publish if I've something particularly burning-important to say.
In the middle of British cherry season, I was discouraged to find Canadian cherries right next to the British cherries in Tesco.
A less discerning shopper might easily pick up the immigrants, which would be a shame given that the British fruit are so seasonally fresh and tasty. And much less travelled.