Main characteristics of blue hydrangeas
The blue hydrangea is an acidophilous shrubby plant and requires an environmental pH of between 4.5 and 5 so that its blooms have a beautiful color in shades of blue or dark purple. With a higher pH, pink or even red inflorescences will be obtained. Hydrangeas easily adapt to different climates and soils of various kinds. They prefer to live in well-shaded areas but can also thrive in full sun. They prefer to be planted in well-drained soils and fats containing a high percentage of organic substances. Winter frosts do not damage them as long as they do not last for weeks without respite. To ensure a better vegetative growth in spring, they must be pruned in September.
The hydrangeas originate from the easternmost region of Asia and are currently fairly widespread throughout the temperate climate zone of the globe. There are different varieties of blue hydrangeas that differ from each other both in their appearance and in the appearance of their inflorescences. or less voluminous, almost spherical in shape. The flowers do not have petals but have modified sepals. Inside the inflorescences there are both fertile and sterile flowers. The sterile ones have clearly visible sepals while the non-prolific ones are hardly noticeable. In recent years, numerous hybrid varieties have been created to improve the appearance of flowers and other physical characteristics such as coloring and leaf shape.
Irrigation and fertilization
To obtain thriving blooms and plants it is necessary to irrigate the soil where they are planted frequently and make sure that you never leave the plants without water for a long time. In the summer season they need to be watered at least once a day after sunset. In this way the hydrangeas will be available all night to absorb the quantity of liquid they need before the sun comes to drain the soil again. As far as fertilization is concerned, already in March a fertilizer can be spread on the ground slow-release organic or add a liquid fertilizer to the irrigation water. If the plant starts to show the first symptoms of leaf chlorosis, it is necessary to repair it with products rich in chelated iron.
Blue hydrangea: Hydrangea pruning
The pruning of the blue hydrangea is an extremely important operation and for this reason it must be completed with particular attention so as not to compromise the subsequent flowering. It would be better to avoid cutting all the branches at the base as many do and eliminate only the very old branches that are no longer vital. The branches that the hydrangea gave birth to the previous year must be maintained but sprung up only in their apical part favor the subsequent release of new butts that will thicken the plant. If you are dealing with an old or under vigorous shrub, prune at least one third of all the branches present. This operation will stimulate the production of new vegetation with the beginnings of the first spring warmth.