Perfect camellias

Q: THE LEAVES on our camellia japonicas are thinning and no longer glossy and dark – they look a bit rusty but there are no insect pests evident. Help!

A: Our experts are the people at Davidson’s Nursery, a Nursery & Garden Industry Australia (NGIA)-accredited wholesale garden centre specialising in the propagation and sale of azaleas and camellias.

As you have checked for pests It sounds as if there could be two issues: sunburn from too much sun and also possibly soil that’s not acid enough.

Camellia japonicas can be sunburnt and their leaves turn brown if they don’t get at least a semi-shaded position.

Ideally, the soil should be quite acid, with a pH of 5 to 5.5. To acidify the soil, add some sulphur, available from a good garden centre and it is best to consult someone knowledgeable there about how much may be required in your case, depending on your soil type. Take some in with you for testing so you can be sure.

In your case, after you check the soil you may also wish to either move the plants to a shadier position or see if you are able to shade them more using other plantings or a shade cloth.

Where to find out more

There is information on azaleas and camellias, including the latest varieties to look out for, at the Davidson’s Nurseries website at www.davidsonsnurseries.com.au

You can also find extensive gardening information at the Nursery & Garden Industry Australia (NGIA) website at www.lifeisagarden.com.au

Camellia Australia is an organisation for camellia enthusiasts. You can find out more at www.camellia.org.au