Winter starts on Dec 21st, Spring starts in March and lasts until 1st May, the first day of summer.. Midsummer is June, autumn is September - December.

I've got 10 different flowers blooming in my garden at the moment, including a rose, a snowdrop, the holly, rosemary and periwinkle... so relying on which flower is out to give you a season isn't sensible.

LTS