Plum trees blossom colours range from pink to purple, depending on the species. Their blooming season falls mainly on January or February. Back in the 1990s plums were considered to be the most widely planted trees in San Francisco. Later on, their number was decreased in order to prevent over-plantation, yet there are still plenty of them growing in the city.
Often plum blossoms may be confused with cherry blossoms, which are actually expected to open in spring months. Recently this confusion has led to a misconception: it was assumed that global warming process resulted into the too early cherry blooming season when, in fact, those were plums.