We have lived in this house a long time, and over 35 years ago I planted a little rosemary bush. It is now a huge rosemary bush. For many years, it would start to flower around the new year and continue all the way through spring, and for the last 10 years or so, it has crept earlier and earlier, and had begun to flower some time in mid-December. Last year it was the beginning of December.
I've just been out in my garden, and the first flowers have opened today.
Has anyone else noticed similar with the plants in your garden?