Ask a Question forum→Monstera Is growing dark brown spots

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California
Ariana59
Jun 6, 2020 11:10 PM CST
I recently purchased a monstera deliciosa and I noticed it began growing some dark spots around the leaves. I repotted the plant since it was very root bound when I got it and I used 50% potting mix And 50% perlite for good drainage. I thought repotting the plant would help it stop growing the dark brown spots but they have continued to show up. I don't have much light coming into my room so I bought a grow light and hanged it above my monstera. I'm not sure if it is getting too much light from the grow light or not enough light. I also make sure to not overwater it or let it dry out to much. I've been using a moisture meter to check when it needs water. I'm not sure what to do to stop these Dark brownish spots from growing on the leaves. Should I snip off the bad leaves? Is there any advice I can get to stop the leaves from turning dark brown.


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Name: one-eye-luke US.Vet.
Texas (Zone 8a)
Quitter's never Win
Hummingbirder Birds Organic Gardener Dog Lover Cat Lover
oneeyeluke
Jun 7, 2020 2:52 AM CST
Moisture meters are not accurite and will cause over or under water issues. Browning edges can indicate too much water. A plant pushes water through to the edge of its leaves, and if given in excess, this can cause veins at the edges to burst, which leads to browning.
NOT A EXPERT! Just a grow worm! I never met a plant I didn’t love.✌
Name: Will Creed
NYC
Prof. plant consultant & educator
Image
WillC
Jun 7, 2020 8:44 AM CST
Welcome! There are several possible causes of Monstera leaf spotting. The most common one is damage done to tiny roothairs during repotting and subsequent issues with proper watering.
Will Creed
Horticultural Help, NYC
www.HorticulturalHelp.com
Contact me directly at [email protected]
I now have a book available on indoor plant care
California
Ariana59
Jun 7, 2020 11:48 AM CST
I don't believe I have overwatered it. I usually also stick my fingers in the soil to check of the soil is still moist along with using the moisture meter to double check if it needs water or not. I have tried to be very careful of not overwatering it. It may have possibly been damage to the tooth hair when I repotted it since I tried to get some soil off the roots when I repotted it. I also suspect a possibility of sunburn due to my grow light being really close to the plant but I'm not sure. Any additional advice on things I can do in order to fix the problem from continuing is greatly appreciated.
Thanks for your help.
Name: Will Creed
NYC
Prof. plant consultant & educator
Image
WillC
Jun 8, 2020 8:08 AM CST
Potting soil usually clings to the tiny root hairs so removing soil usually damages those root hairs. It will take time for the roots to recover and there is no quick fix. I suggest you trust your finger and not use the meter as a double-check.

LED and fluorescent grow lights don't give off enough heat to burn plants, but incandescents do and are not recommended for that reason.
Will Creed
Horticultural Help, NYC
www.HorticulturalHelp.com
Contact me directly at [email protected]
I now have a book available on indoor plant care

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