Knowledge of a large number of folk signs helps in everyday life. For example, leaving for the weekend and seeing how the buds on bird cherry tassels have swollen on a familiar tree at the entrance, it will be useful to take a couple of warm clothes with you in case of a cold snap, and be sure to grab an umbrella.
Wonderful May days, a white boil of gardens, forests and groves, when the tender young greenery is practically invisible. Winter reminders in the form of morning frosts, sudden low temperatures, and even snow and hail accompany the flowering of your favorite shrubs-trees. It is getting colder, and at least something for bird cherry.
They say that you can find out what summer days will be like in advance: signs associated with the abundance of color on the bird cherry speak of the coming rainy summer. Bird cherry is extremely cold-resistant, but phenologists believe that it opens its buds only with the entry of spring into real force. The connection of blooming bird cherry with cold days is considered unchanged. But it turns out that they do not always coincide - cold and bird cherry color: sometimes it is warm, sometimes it is just rainy.
And yet, for flowering and the formation of bird cherry ovaries, cold days and nights are desirable, and heat accompanies its flowering only in 30% of cases. It forms flower buds on racemes on warm days, mainly in May, preparing to open flowers during the return of low temperatures. That is, speaking about the relationship of cold weather and bird cherry, they mistakenly change places between the cause and the effect. In cool weather, flowering is longer, therefore, more berries are tied. In addition, the activity of insect pests that are dangerous to the plant is reduced.
There are many more events related to the cooling in nature: the flowering of the oak and some other representatives of the flora, the spawning of frogs and the spawning of certain species of fish, but only the bird cherry was included in the observation known to almost everyone. We can safely say that perpetuation in omen is a tribute to the magical beauty of a tree covered with white and fragrant.
There are many answers to the question why, when the bird cherry blossoms, the cold sets in. There is such an explanation for the cooling during spring flowering, as an increase in the oxygen content, "thrown out" by the emerging foliage. Accordingly, the content of carbon dioxide, which is responsible for the "greenhouse effect", decreases in the atmosphere, and the air temperature decreases.
The next in a series of reasons is called white, supposedly reflecting the sun's rays, preventing them from warming up the atmosphere. In addition, the appearance of foliage is indicated, obscuring the soil and preventing its insolation and general warming. All of the above options have a right to exist, although they have nothing to do with the process caused by the seasonal movement of air masses and the replacement of anticyclones by cyclones, leading to a drop in thermometer columns.
