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Question: my suffering camellia

my camellia after 2/3 years started to lose some leaves (brown, then some branch dried up, I brought leaves to the consortium to get a remedy, Calypso Bayer Protector recommended, after some operations, check some new leaves with some ears, but the plant seems firm, few flowers fall almost immediately, some do not bloom, fertilized monthly with: NPK3-15-10 + 2MgO + Cu, Zn, plant height: full ground acid drop irrigation 10min alternate days what you recommend to do? thanks, greetings mario

Camelia: Answer cultivate camellias

Dear Mario,
I have little idea of ​​the suggestion they gave you in the nursery, evaluating the explanation of the symptoms of your camellia: in the nursery they recommended a broad-spectrum insecticide, also containing white oil; it is a product to be used with caution, when there are no flowers in the garden, possibly in a period in which the plant does not have buds or buds, given that it is broad-spectrum, and therefore risks going to kill all the insects of the garden, even useful ones. Also, from your explanation, you don't talk to me about insects, but rather about some rot or fungal disease; otherwise I think you would have seen them in some way.
However, having said that, I think your camellia seems to show a kind of impatience with a certain excess of care; from what you tell you are a passionate cultivator, who does not miss anything for his plants. Unfortunately, camellias are quite bizarre plants, despite being resistant and vigorous; therefore your shrub probably does not like the care you reserve to the full.
First of all, it often happens that shrubs with a dedicated irrigation system are intolerant of the quantity of water supplied in a "standard" way: camellias love to have a fresh soil, but at the same time they do not like stagnations, which quickly cause fungal diseases to the radical apparatus. Therefore, watering should be provided only when the soil is dry, particularly insisting during the flowering period. Also the fertilizer is often a problem with these plants, because in the long run they tend not to love the accumulation of mineral salts in the soil. In general, camellias are fertilized immediately after flowering, in late winter or early spring, and in early autumn; in both cases a slow release granular fertilizer is used, specific for acidophilic plants. Avoid periodic fertilization, because camellias do not have great needs for mineral salts, and therefore over time many of the salts supplied with the fertilizer tend to remain in the soil, causing damage to the roots of your plant.