Question: Magnolia

Good morning,

I have a deciduous magnolia, it has purple pink flowers this summer it started to turn yellow and lose its leaves, do you know if it is due to excessive irrigation or not enough, or from some fungus / parasite?

Thanks in advance

Vittorio brands

Answer: Magnolia

Dear Vittorio,

the soulangeana magnolias are hybrid shrubs, whose progenitors have Asian origins; it is a resistant shrub or small tree, which generally does not suffer excessively from pests or diseases; unlike many other species of magnolia, it tolerates alkaline or neutral soils well, as well as summer heat or winter cold. But even these shrubs have an Achilles thallus: they generally don't like to be watered a lot, or in any case a heavy and always humid soil; for this reason, after the plants have stabilized in a garden, in the open ground, they tend to let them settle for rainwater. Clearly, every year the seasons are very different from the previous ones, with periods of particular climate; for example, spring 2013 was very humid and cold, and this climate could have favored the development of root rot, or in any case it could have weakened the plant. Just as they suffer from excess water in the soil, soulangeana magnolias can suffer in the same way from lack of watering, which becomes particularly heavy if the climate is dry, and without rain, for long weeks, in summer. Since you don't tell us what care you are giving to your magnolia, it is difficult to lean towards one problem or the other. These shrubs put a lot of their energy into producing the large spring flowers; this often causes a state of low vigor in the shrub, which in the following months tends to prematurely lose part of the foliage, either due to water problems, or to problems related to nutritional deficiencies. It is usually a sporadic event, which does not involve the loss of much of the vegetation, and later, on the arrival of autumn, the shrub loses all its foliage, and enters vegetative rest, which allows it to recover from summer vegetative stress, to prepare for the next year's flowering. So, if only a few leaves fall, in a completely sporadic way, don't worry, it's normal, and it could depend on the annual climate trend. If, on the other hand, there are a lot of falling leaves, check the humidity of the soil, if there is too much watering; if, on the other hand, the soil is dry and dry, try watering abundantly, at least once a week, until autumn arrives. Before the vegetative rest, spread a little mature manure, or a slow release granular fertilizer on the soil.

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