Contact your local county Extension office through our County Office List.

   
Planttalk Colorado™ is sponsored by Colorado State University Extension, Denver Botanic gardens, and the Green Industries of Colorado. For additional information on gardening, see Plant Select® and Extension Publications.

1345 – Gardenia   Arrow divider image - marks separation between nested pages that are listed as breadcrumbs.

Gardenia
The common gardenia is native to southern China where they grow into upright shrubs with green, waxy foliage and exceptionally sweet, fragrant, long-lasting flowers.

Gardenias need very high light for more than four hours daily to grow well and flower. Night temperatures must be between 40 and 60 degrees Fahrenheit to set buds. They grow best in acidic, evenly moist potting mix. Never let these plants dry to wilting; they will not recover.

Gardenias will thrive in 50 to 60 percent relative humidity and should be fertilized every two weeks from March through August with a water-soluble, high nitrogen, acidic fertilizer. Use a potting mix with that drains well.

Use gardenias as a potted plant and for cut flowers.

Gardenias occasionally attract pests including mealybugs, spider mites, whitefly and scale.

For “Greenhouse whitefly” refer to message number 1448.

For more information, see the following Colorado State University Extension fact sheet(s).

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