Gardenia jasminoides

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Gardenia jasminoides is an evergreen flowering plant of the family Rubiaceae. It is a shrub with greyish bark and dark green shiny evergreen leaves with prominent veins. The white flowers bloom in spring and summer and are highly fragrant. They are followed by small oval fruit.



It is widely used in gardens in warm temperate and subtropical climates, and as a houseplant in temperate regions. Many varieties have been bred for horticulture, with low growing, and large-and long-flowering forms.



As a subtropical plant, it thrives best in warm temperatures in humid environments. Getting those conditions is rather hard in temperate latitudes, the reason for which gardenias are usually cultivated as houseplants or in greenhouses. In warm places, though, it can be grown outdoors. Either way, it prefers bright indirect sunlight or partial shade.



Apart from the difficulties in creating suitable conditions for the plant to live, gardenias need to be planted in an acidic soil (it is a calcifuge). If the soil is not acid enough, many of its nutrients (especially iron compounds) will not be available for the plant, since they will not dilute in water and therefore will not be absorbed via the roots. If this happens, gardenias start to develop chlorosis, whose main symptom is a yellowing of the leaves.



For this reason, it is advisable not to water gardenias with very hard water. When having to water with hard water, it is possible to add some vinegar or lemon juice to it before doing so, this will lower the pH of the water. Or use an effective pH modifier, like phosphoric or nitric acid.



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