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Christmas Cactus Spots?

Posted by susansms (My Page) on
Sat, Jan 25, 14 at 14:09

Our Christmas Cactus has developed discoloration of some leaves that turn into hard white areas. We have the plant on our lanai in Florida, where it has been somewhat cold at night--50 degrees. In the daytime, the lanai is about 70 degrees. Any idea what might be the problem, and suggestions as to how to fix?

Thank you.


Follow-Up Postings:

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RE: Christmas Cactus Spots?

I'm going to go out on a limb here but are you near the ocean? To me it looks like water spots from the salty air. These plants can usually tolerate 50 degrees but maybe the humidity in the air condenses on the stems. That's my best guess with the info provided.


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RE: Christmas Cactus Spots?

I wonder if this is oedema.

"Oedema is a disorder of plants caused by the roots taking up more water than the leaves can transpire. This excess water ruptures the cells, particularly on the undersides, and leads to water-soaked patches that turn corky and unsightly."
- rhs.org.uk


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RE: Christmas Cactus Spots?

Christmas cacti LIKE cold, so it's not the 50 degree temperatures you referred to. How compact is your soil? If it's too compact, it can affect the leaves, usually making them thin and wrinkled looking.


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