Apartment plants

Yellowed gardenia

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Question: Yellowed gardenia

Why does gardenia make yellow leaves?


Answer: Yellowed gardenia

Dear Lucia,

gardenias belong to a genus of small or medium sized shrubs, widespread in Asia, Africa and Oceania; in particular in the nursery we find hybrids, often obtained from two species, gardenia jasminoides and gardenia grandiflora. They are particularly appreciated for the beautiful dark foliage and for the flowers, with the fleshy petals, decidedly very fragrant, in fact also used in the perfume industry. Gardenias in nature are evergreen shrubs that develop in the undergrowth, semi-shaded, fresh and humid. Similarly, in the apartment or in the garden, we will have to try to grow it in conditions similar to those found in nature. So we position our gardenia in a bright half-shade, where, however, it does not receive too many hours of direct sunlight, especially in the hottest hours of the day. Let's water regularly, but avoid water stagnations, otherwise the plant could suffer a lot; excess watering is often one of the causes of leaf yellowing; let's water regularly, but only when the soil is quite dry; rather, especially in the hot season and in winter if the plant is grown at home, we vaporize the foliage. The typical soil of the undergrowth has an acid pH, gardenias are acidophilic plants, such as azaleas or hydrangeas; if they are grown in the common universal soil, or are watered with water rich in limestone, they tend to be affected by ferric chlorosis, which typically causes yellowing of the leaves. The leaves affected by chlorosis remain very light in color, but without drying out or falling. To avoid this event, it is advisable, first of all, to cultivate gardenias in good soil for acidophilic plants; secondly it would be advisable to water them with limestone-free water; and also it is good to provide, in late winter and late summer, a greening fertilizer, which increases the quantity of iron bioavailable in the soil.

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