Ask a Question forum: Diagnosis: Rust like film on indoor plant pot

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Mar 12, 2017 10:01 AM CST
I have been growing two avocado plants indoors for the past two years and recently, they have developed a orange/rust looking film on the side of the pot. Can anyone help me and tell me why this is happening? They are in glass containers (and have out grown them I have been meaning to replant them for a while now but want to eradicate this film before hand?) and sit in the light for the majority of the day. Overwatering is most likely not the issue, but I am open to any suggestions. Attached is an image of the film around the rim of the pot.
Thumb of 2017-03-12/lyndsaybakes/e3a0f7

Name: Celia
West Valley City, Utah (Zone 7a)
Pour vivre parmi les fleurs
Irises Garden Photography I was one of the first 300 contributors to the plant database! Celebrating Gardening: 2015 Butterflies Birds
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Mar 12, 2017 10:04 AM CST
Hard water deposits would be my first guess.
Name: Porkpal
Richmond, TX
Charter ATP Member I was one of the first 300 contributors to the plant database! Keeper of Poultry Farmer Roses Raises cows
Garden Ideas: Level 2 Celebrating Gardening: 2015 Plant Identifier
Mar 12, 2017 10:05 AM CST
A mineral deposit, perhaps?
Name: Will Creed
Professional indoor plant consultan
Mar 12, 2017 2:48 PM CST
Those are mineral deposits. Hard water, poor soil quality and over fertilizing are the likely sources. If your water is hard, use filtered, distilled or rain water. Indoor plants use nutrients (minerals) in very minute quantities so using compost or outdoor potting soils may add excess mineral salts to the mix. If you are fertilizing, stop.

There is nothing in the photo that suggest that your plant needs repotting.

Scrape off the mineral deposits and make the appropriate adjustments.
Will Creed
Horticultural Help, NYC
I now have a book available on indoor plant care

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