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House Plants/Citrus plant leaves unhealthy

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Question
Hi,
I live in India. I have orange and lemon trees grown in pot and are 1 year old each. I recently repotted these plants because I noticed the fading of leaf colour to yellowish-green with dark green veins on leaf. I added coco peat and compost to the new pot along with loamy soil. But still not healthy and no growth. Some told me its due to iron deficiency and others told me due to high pH. I dnt know wat exactly. If these are the case then what is the best organic source of iron? And how to lower ph using vinegar? Because here i can find only such things. If its due to other reason, Please help me, I cant see thew dying. I have grown these from seeds. And is it good to use neem oil to control pest?

Answer
Hi there,

Most potted plants, including citrus trees, do best if the soil pH is in the 5.5 to 6.5 range. This means that the soil is slightly acidic. (On the pH scale, 1.0 is highly acid, 7.0 is neutral, 14.0 is highly basic or alkaline). It is in this slightly acidic range that essential plant nutrients are more soluble and most available for plants to use. When soil pH is outside of this range, the plant cannot absorb the nutrients. If a plant shows signs of nutrient deficiency, check the pH first.

In my experience, the classic symptoms of nutrient deficiencies are due to improper pH, not lack of nutrients in the soil. If the soil pH is outside the proper range, all the fertilizer supplements in the world will not help.

If the water in your area is hard or has high mineral content, that may gradually affect the pH of your potting soil. Hard water is not good for plants anyway, so it is best to use filtered or distilled water instead.

As soil ages, it tends to become gradually more acidic. For older plants, check the pH periodically. The addition of lime to the soil will raise the pH to an acceptable level. The addition of sulfur or iron sulfate will lower soil pH if it is too high. I cannot possibly tell you what is available to use in your area to lower soil pH.

Neem oil is somewhat effective on some plant pests.

I have written articles on fertilizer and on indoor plant pests that I will email for free to you (or anyone else) who emails a request to me at wcreed@HorticulturalHelp.com.

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

If this information has been helpful, please click the Rate Volunteer bar below and enter a rating and nomination for me. I am a volunteer on this site so Ratings are the only compensation I receive for answering plant questions.

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Regards,
Will Creed, Interior Landscaper
Horticultural Help, NYC

Visit my website at: A link to HorticulturalHelp.com  

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Will Creed

Expertise

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.

Experience

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.

Education/Credentials
BA, Amherst College

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