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House Plants/Help with Shamrock (Oxalis)


White dots
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QUESTION: Over the past few weeks my oxalis has developed some very strange looking white spots on the tops of its leaves. In the places where the spots are it is like the chlorophyl is all gone and u can see thru the spot to the other side. There are also spots that'll like they might possibly be burns. I put a filter on the window they are close to thinking it might have been to hot for them. However, it seems to be getting worse. U can see in the pics that all four plants now have this issue. I have been growing these plants since I was a wee girl in Ireland, and I have never had this issue. Any ideas would be greatly appreciated. Also should I cut back the damaged leaves?

ANSWER: Hi Caoimhe,

Your Oxalis appears to have a scale insect infestation. Scale can be treated with a very thorough spraying with a solution of 5 parts water, 1 part alcohol and a squirt of liquid dish soap. However, because Oxalis leaves are thin and fragile they are hard to clean. Therefore, I recommend cutting back all of or most of the leaf stems - certainly all that appear to be infested - before spraying whatever remains. Pruning off all infested parts may seem radical, but it is the most effective long term treatment and if your plant is healthy, new growth will return before long.

I have written a detailed article on treating indoor plant pests  that I will email for free to you (or anyone else) who emails a request to me at I have also written an indoor plant care book in a PDF format that I can sell you if you contact me at my email address.

Please let me know if any of this is unclear or if you have any additional questions.

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---------- FOLLOW-UP ----------

QUESTION: How often should I treat the plants? Is this just a one off spraying or is there a certain regimen I should follow?

Hi Caoimhe,

If you are really thorough in spraying all leaf and stem surfaces, one treatment should be adequate. Cutting off the infested leaves and stems will make complete coverage a lot easier. That said, you should be watchful for any signs on new scales developing and re-treat if you see any. If you catch the scale insects early, they are much easier to treat.


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Will Creed


I am the only expert in this category with professional hands-on experience and knowledge of all indoor plants. I can answer questions regarding light, water, fertilizer, repotting, pruning and humidity and temperature requirements. I can identify plant pests and provide information on safe, effective treatments. My answers are based on 35 years of professional experience and scientific research and are clear and easy to understand. I do NOT use search engines to find answers to your questions. If you read my previous posts here, you will get a good idea as to how thorough and professional my answers are.


I have over 35 years of professional indoor landscaping experience caring for plants in homes, offices, building lobbies, stores, restaurants, and other adverse environments. I have written extensively on the care of indoor plants, including a 260 page book. My specialties include Ficus trees, low light plants, repotting, pest control, and re-blooming holiday plants. Be sure to check my ratings and nominations to learn why I am the top-rated indoor plant expert. I am the only House Plant expert consistently ranked in the AllExperts Top 20.

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