Ask a Question forum→Yellow discolouration on my Calathea Orbifolia

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Name: Jake
Western Australia
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Blueanatomy
May 12, 2020 1:40 AM CST
Hi I have this Orbifolia for 3 months now and it was looking really good and no brown tips as I maintained humidity above 50% using humidifier and pebble tray; also used right watering but used tao water that was left in the bucket for 48 hours before using.

I repotted in last month and after few weeks it's still okay however I just noticed 2 weeks ago that it has doscolaration more like yellow in weird pattern. I suspected infestation but it was clear; I sprayed neem oil for consecutive every 3-4 days. But the yellowing still there. Soil is moist not overwatered. Gets a bright light like 1-2 feet from glass door with filtered light sheer curtain. Help please should I be concerned? Temperature has dropped a bit now that it's Autumn here in Australia
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Name: Will Creed
NYC
Prof. plant consultant & educator
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WillC
May 12, 2020 8:43 AM CST
What is the quality of your tap water? Is it hard?

Sheers filter out most of the light that a plant requires. Your Calathea does want protection from the direct rays of the sun, but otherwise as much indirect sunlight as possible. Try to place it just beyond the reach of the sun through an uncovered window.

When you repotted, how much of the original soil did you remove and replace?
Will Creed
Horticultural Help, NYC
www.HorticulturalHelp.com
Contact me directly at [email protected]
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Name: Jake
Western Australia
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Blueanatomy
May 12, 2020 8:48 AM CST
I'm so bad I removed all of the original soil haha. Only left a bit where the roots are clinging or anchored to. I have been using tap water which I know is a bit hard and just leave it for 24-48 hours as per people say. Bit this time I'm going to use filtered water and see how it goes.

I've read that fading marks similar to this is apparently from too much light exposure... it was in the bathroom east facing window with blinds and frosted glass. I'm not sure if that made it fade and start to lose color
Name: Will Creed
NYC
Prof. plant consultant & educator
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WillC
May 12, 2020 9:25 AM CST
I don't think that light has been the problem, but hard water may be. Those "people" are wrong. Letting water sit overnight just causes some of the water to evaporate and actually concentrates the mineral salts (that do not evaporate) to concentrate even more!

The repotting that you did is much more complex and potentially more damaging due to the damage done to the roots when the soil was removed. Time will tell, but future issues are lilikely lly to be a result of that repotting that was unnecessary.
Will Creed
Horticultural Help, NYC
www.HorticulturalHelp.com
Contact me directly at [email protected]
I now have a book available on indoor plant care
Name: Jake
Western Australia
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Blueanatomy
May 12, 2020 9:31 AM CST
Yes I do realise the mistake done. Haha. It was so lush before.. but I don't even know the best Calathea potting mix I only had them for 3 months...

Yeah I will start watering now with distilled with these fuzzy ones.

What should I do now? I repotted all of them haha!!!
Name: Will Creed
NYC
Prof. plant consultant & educator
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WillC
May 12, 2020 9:34 AM CST
Do your best to keep the soil around the roots damp but not wet. That is easier said than done but really depends on the quality of the soil, the damage to the roots, and the size of the pot. There is no easy answer.
Will Creed
Horticultural Help, NYC
www.HorticulturalHelp.com
Contact me directly at [email protected]
I now have a book available on indoor plant care
Name: Jake
Western Australia
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Blueanatomy
May 12, 2020 9:38 AM CST
I will keep an eye on them. The soil seems okayish, still damp. I did not changed the size of the pot and still on plastic ones. Keeping the moisture bit longer.

Do you recommend when it gets dry I water it with gogo juice, seasol and soluble fertiliser in half strength solution? Or just plain distilled water?
Name: Will Creed
NYC
Prof. plant consultant & educator
Image
WillC
May 12, 2020 9:40 AM CST
No supplements or snake oil. Just distilled water.
Will Creed
Horticultural Help, NYC
www.HorticulturalHelp.com
Contact me directly at [email protected]
I now have a book available on indoor plant care
Name: Jake
Western Australia
Image
Blueanatomy
May 12, 2020 9:42 AM CST
Yeah I guess it's better to just stick to plain distilled water until this issue is resolved rather than adding more issues. It's like when you're sick you don't want a buffet but plain old bland diet aha.

Thank you so much Will
Name: Will Creed
NYC
Prof. plant consultant & educator
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WillC
May 12, 2020 9:50 AM CST
Crossing Fingers!
Will Creed
Horticultural Help, NYC
www.HorticulturalHelp.com
Contact me directly at [email protected]
I now have a book available on indoor plant care
Name: Lin Vosbury
Sebastian, Florida (Zone 10a)

Region: United States of America Deer Region: Florida Charter ATP Member Million Pollinator Garden Challenge I was one of the first 300 contributors to the plant database!
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plantladylin
May 12, 2020 9:53 AM CST
The yellowing coloration on the foliage of your Prayer Plant (Goeppertia orbifolia) does not look like sun damage to me. My thought is that it's likely a combination of the repotting and a watering issue. Does the new pot have drainage holes? I think I see what appears to be tiny pebbles atop the soil, which can deter proper drainage.
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Name: Jake
Western Australia
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Blueanatomy
May 12, 2020 9:58 AM CST
plantladylin said:The yellowing coloration on the foliage of your Prayer Plant (Goeppertia orbifolia) does not look like sun damage to me. My thought is that it's likely a combination of the repotting and a watering issue. Does the new pot have drainage holes? I think I see what appears to be tiny pebbles atop the soil, which can deter proper drainage.


Hi, yes there's drainage holes. It's just a pebble tray it's on to increase humidity for these Calatheas. Yeah it was repotted last month around first week or April and I have been using the stagnant tap water which I was aware that it is hard water as it forms stains on foliage on my other plants when I water.

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