Black spot on strelitzia flowers AFTER opening

Zone Sydney Australia | Claudia25 added on September 12, 2017 | Answered

Hi. In my new garden, I have inherited a Strelitzia, which is very overgrown and badly in need of a prune. I have noticed that it flowers beautifully, but black spots develop once the flowers open. Help!

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Certified GKH Gardening Expert
Answered on September 13, 2017

This plant seems to be suffering from either a bacterial or fungal infection. Luckily there are a few things you can do to help it out. I recommend putting wettable sulfur around the soil, along with a little dolomitic lime, and try to keep it from getting overly wet. You may also spray the plant with one or more of the following: Garlic oil, neem oil, rosemary oil, lavender oil, or mint oil. All of these have wonderful antiseptic properties. Here is an article of over-all care of the plant.

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