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Hibiscus fungus. What to do?


Matt in OC

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Hard to tell from this pic, but I have dark spots on almost all the leaves of this hibiscus which is a decent size at this point. I understand that once the leaves have the fungus it can't be removed, but you can try to keep it from spreading. Should I just start over?

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If it were mine, i'd  give 'em a haircut and throw the clippings in the trash ..as to not spread any possible fungi to other stuff ..then fertilize them. ( look a bit  hungry in the picture )  Have had hibiscus that did the exact same thing after a cool wet winter, or rainy hot summer both in my own collection, and caring for 100's of plants in the Nursery.. 

Remember, low on the Phosphorus ( ..no more than say 10%  1 or 2 X's a year only. More WILL kill these ) High on the K ( Potassium ..12-15%  3 x's per yr ) about average on the Nitrogen ( 8% should be fine ) ..and a dose of Iron for the year. Should look fine in a few weeks now that everyone is starting to warm up / plants pushing fresh spring growth.  Sul-Po-Mag and some Crab / Oyster shell Meal work wonders w / Hibiscus.. among other stuff..

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Thanks for the advice. It just looks awful, but is pushing out some new growth.  I'll do some significant pruning this week. 

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We grow hundreds of hibiscus, and we get this too - even in the tropics. This link - from the HVH link above - explains things nicely. http://www.hiddenvalleyhibiscus.com/care/leaffungus.htm

Where we live, humidity is very high and leaves become wet almost every night. I think our relatively warmer temps may keep the spotting to a minimum.

I'm thinking you might be getting too much water on your leaves - or just that with your wet year along with the persistent low Feb temps - things are worse than in a normal year.

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Kona, on The Big Island
Hawaii - Land of Volcanoes

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