Gathered in inflorescences with the typical sphere shape, which in botanical are called corymbs, the flowers of this plant are mostly sterile, especially those that grow in the outer part.It may seem strange, but the degree of acidity of the soil in which they grow determines the different colors of the flowers: a soil with a high level of acidity determines, for example, the birth of blue flowers.The Hydrangea macrophilla species, which produces beautiful red, white or pink inflorescences, is perfect for decorating outdoor environments of villas or apartment buildings, adding a touch of class and poetry that never hurts and enhances the living environment, making it more pleasant.General information on the history of the plant: why this name was chosen
The name is the result of a curious choice by Philibert Commerson, a French scholar accustomed to traveling the world in search of new discoveries in the field of botany, which made them known in Europe by importing them from China in the eighteenth century.
The word Ortensia has a very romantic history: it derives from a beautiful woman named Hortense, who was the wife of the astronomer Jerome Lalande, of whom Commerson had fallen madly in love.
How to cultivate Hydrangea to get good results
The cultivation land must be moorland, a particular type of acid heath, plus sand and soil. The plant should be exposed preferably in partial shade and the waterings should be rather abundant.
During the warm months it is advisable to supply good quantities of liquid fertilizer, useful for giving new vigor to the Ortensia.
How to proceed with regard to pruning. The right time
It is advisable to provide for operations relating to pruning before resuming vegetative activity. The branches must be cut significantly, taking care to leave only two or at most three buds for each branch. Pruning will contribute to restoring vitality and momentum to the plant, renewing its basic vital mechanism.
The enemies of the Hydrangeas. The symptoms of diseases and the presence of parasites
Those who want to try to cultivate these beautiful flowers must estimate that, like all plants, even Hydrangeas can become ill or otherwise encounter problems of various kinds, which must be resolved as soon as possible.
The enemies of these plants are aphids like the Rhopalosiphum dianthi, that is the classic plant lice, very small phyto-insectic insects that are part of the Rhynchota order.
The Ditylenchus dipsaci, a polyphagous endoparasite worm, very widespread in areas with a temperate climate and therefore also in Italy, produces instead ulcerations on the stem.
The parasitic fungus called Botrytis cinerea causes the terrible gray mold, which often causes the death of the Hydrangeas without a timely intervention with specific curative products.
If the general development of the plant appears problematic and in particular the flowering does not seem to regulate, probably the plant was hit by a virus.
If, on the other hand, the leaves appear to be gnawed, Stasiodis parvulos, another parasite, is in action.
In all these cases it is advisable to go to stores specialized in gardening to purchase the insecticidal products from time to time required by the nature and gravity of the infestation or in any case of the development problem manifested by the Hydrangeas.
The classic operations of ordinary pruning of the Hydrangeas also serve to better examine the objective conditions of the plant, giving occasion to note the various symptoms listed in our treatment.