Plan the perfect garden with our interactive tool →

Gardenia Plant With Leaves Turning Brown

...
Medioimages/Photodisc/Photodisc/Getty Images

The waxy, dark green leaves of a gardenia plant frame its flowers, making the shrub look even more attractive. If the leaves begin to turn brown, however, the bush can become unappealing and gardeners should take note: brown leaves are often a sign of an unhealthy growing environment, disease or pest problem.

Causes

Gardenias require high humidity for successful growth; warm, dry heat will turn the leaves brown quickly. Aphids and other pest insects feed on gardenias, turning the leaves brown. Some diseases that affect gardenias and cause the leaves to become brown include powdery mildew and a number of leaf spot diseases caused by fungi. Fungal leaf spot diseases cause the leaves to turn brown at the tips and across the surface of the leaves.

Water Needs

Gardenias should be watered at least once a week to keep the moisture level of the soil high. However, the soil should be able to drain water to prevent fungi from growing in the standing water; this can lead to leaf spot diseases and root diseases that affect the health of the gardenia. Water gardenias in the morning so water is not left standing on the leaves during the day, which can encourage powdery mildew.

  • The waxy, dark green leaves of a gardenia plant frame its flowers, making the shrub look even more attractive.
  • Fungal leaf spot diseases cause the leaves to turn brown at the tips and across the surface of the leaves.

Pesticides

Spraying gardenia bushes with a pesticide in the early spring helps destroy aphid populations and keeps them from feeding on the leaves of the gardenia. Aphids are a serious problem, as they frequently spread fungal diseases to gardenias or leave wounds in the plants that diseases enter. Aphids not only damage gardenias themselves, they make the gardenia more susceptible to fungal leaf spot problems that turn the leaves brown. Apply pesticides according to the directions for the best results.

Fungicides and Cultural Control

Remove leaves affected with fungal spots to stop the disease from spreading to other parts of the gardenia shrub and doing further damage, and pick up any fallen leaves that fungi could live on. Prune the gardenia annually and remove any weak or previously diseased sections of the bush to prevent them from contracting or spreading fungal leaf spot diseases further. Apply a fungicide to the gardenia to help kill off existing spores and spore spots.

  • Spraying gardenia bushes with a pesticide in the early spring helps destroy aphid populations and keeps them from feeding on the leaves of the gardenia.
  • Remove leaves affected with fungal spots to stop the disease from spreading to other parts of the gardenia shrub and doing further damage, and pick up any fallen leaves that fungi could live on.

Related Articles

The Leaves on My Gardenia Bushes Are Turning Brown on the Ends
The Leaves on My Gardenia Bushes Are Turning Brown...
How to Care for a Gardenia Plant
How to Care for a Gardenia Plant
Yellow Leaves & Brown Spots on Gardenias
Yellow Leaves & Brown Spots on Gardenias
How to Make Gardenias Bloom All Year
How to Make Gardenias Bloom All Year
How to Feed Gardenias
How to Feed Gardenias
Are Gardenias Annuals or Perennials?
Are Gardenias Annuals or Perennials?
Gardenia Root Rot Cures
Gardenia Root Rot Cures
Gardenia Plant Disease
Gardenia Plant Disease
How to Grow Gardenia Plants
How to Grow Gardenia Plants
Gardenia Flowers
Gardenia Flowers
Brown Spots on a Rhododendron
Brown Spots on a Rhododendron
Growing Gardenias in Dallas
Growing Gardenias in Dallas
Gardenias and Freezing Temperatures
Gardenias and Freezing Temperatures
How to Grow a Gardenia in Florida
How to Grow a Gardenia in Florida
Why Won't My Gardenia Bush Bloom?
Why Won't My Gardenia Bush Bloom?
How to Kill Cercospora in the Hydrangea
How to Kill Cercospora in the Hydrangea
Garden Guides
×