Gardenia With Brown Spots

dthrooopMay 16, 2010

Hi,

My Gardenia (veitchii) has some brown spots on the leaves and I'm not sure what it is. Too much water or a PH issue? Also, the newer leaves seem a very pale yellow. Any help with these issues would be appreciated.

A link to the photo is below...

Here is a link that might be useful: Gardenia With Brown Spots

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buyorsell888(Zone 8 Portland OR)

The new growth is showing iron deficiency which can often be caused by high soil ph.

Very common on gardenias, look for an "acid" fertilizer that contains iron such as MirAcid by Miracle Gro though there are others.

    Bookmark   May 16, 2010 at 12:57PM
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Dan Staley

Since we don't know where the OP lives, it is impossible to diagnose accurately. Nonetheless, it looks to me as well like chlorosis. Iron chelate for fast green-up, acidify the soil prior to planting any more.

Dan

    Bookmark   May 16, 2010 at 2:00PM
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dthrooop

Thank you for the quick follow ups. I'll get some acid fertilizer/iron chelate to address the yellowing. Are the brown spots a result of the chlorosis as well?

thanks,
dthroop

    Bookmark   May 16, 2010 at 4:12PM
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ken_adrian Adrian MI cold Z5

the brown spots are an external injury to the leaf... it has nothing to do with the other suggestion ....

how it.. or what happened.. is speculative ...

in my zone.. that would be cold damage ...

in yours.. water drops on a particluarly hot day when the leaf was very young.. and the sun heated it??

chemical lawn spray...

so many options.. i doubt you will ever really know ...

but the rest of the plant looks fine.. if it were me.. i would leave them ... if you want to pick off a few leaves i dont see where that would hurt a large plant ...

ken

    Bookmark   May 17, 2010 at 8:43AM
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dthrooop

Thanks, Ken. We did have a pest control treatment the other week, and that's the only chemical I can think of that might have caused any damage. But, as you noted, there are many possible options. I'll pull some leaves off of one plant and keep an eye on it.
Regards...

    Bookmark   May 17, 2010 at 11:54PM
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jean001(z8aPortland, OR)

where do you live? is the gardenia in the ground or a pot?

    Bookmark   May 18, 2010 at 1:20AM
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Dan Staley

That sort of necrosis could be several things, but if the spots appeared suddenly, you'll want to change consumer pest service companies.

Dan

    Bookmark   May 18, 2010 at 9:48AM
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