How Much Sun Should You Give Gardenias?

Written by Melody Lee; Updated December 28, 2018

Gardenias (Gardenia jasminoides) are known for their fragrant, waxy white flowers that bloom from early spring to early summer. Orange or yellowish-red berries that attract birds and other wildlife develop in late summer and fall. Gardenias have glossy green foliage and are attractive as specimen plants, accent plants in mixed borders or hedge plants in full sun to partial shade. They grow in U.S. Department of Agriculture plant hardiness zones 7b through 10 in full sun to partial shade.

Needs Bright Light

In hot climates, gardenias grow best with morning sun and afternoon shade. They also grow well in light filtered shade under tall trees, such as oaks or pines. They can tolerate full sun in cooler areas, especially if their root area is covered with organic mulch. Set gardenias growing in containers in bright light or filtered shade with no direct sun. Gardenias grown indoors should receive at least six hours of light through a sunny window that faces south or west.

Light Affects Growth

Gardenias in too much shade grow long, spindly stems with weak, thin leaves. They do not form as many flower buds, and the buds may drop off before they open. The flowers on gardenias in too much sun usually turn brown faster than those in some shade. Gardenias bloom better in areas with high humidity and daytime temperatures from 65 to 70 degrees Fahrenheit. Periods of shade increase the humidity and lower the temperature around gardenias.

Growing Conditions

Gardenias need acidic soil with a pH between 5 and 6.5 for optimal growth. They prefer well-drained, organic soil and regular irrigation. Gardenias have shallow roots that can be damaged by cultivation. Add a layer of composted plant material or cow manure and top with a layer of mulch to add nutrients to the soil and keep it moist.

Other Considerations

Freezing temperatures can cause gardenias to lose their leaves or die back, but they usually grow back in the spring. To protect them from drying winter winds, plant them to the east or north of buildings or other structures. Gardenias should not be planted near concrete surfaces; the run-off is usually alkaline and will raise the pH of the soil.

About the Author

Melody Lee


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