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Posted 2Y ago by @Madelinewagnaar

Brown spots

#Monstera My monstera has been very happy and pushing out many new leaves. The last week or so I have noitcied these brown spots developing. They start as yellow and become brown and crispy. I always use my moisture meter to make sure it’s dry before watering. Not sure if these spots could possibly be from harsh sun or maybe a bacterial infection. Would treating the plant with copper fungicide hurt it if there is no infection? Help please! Thank you for any advice:)
0ft to light, direct
7” pot with drainage
Last watered 1 week ago
I wish I had the answer for you but I have to say, your Monstera is GORGEOUS
Here's a picture guide. According to the guide you might want to go ahead and give it a treatment.
The only way I can see doing a fungicide treatment hurting the plant is if you just fertilized recently. Otherwise, doing a fungicide treatment once a month is a good routine to get into anyway
@ranchinhippie Thank you!!
@PerfectPinkpoui awesome thank you so much!!
@Madelinewagnaar It's great to hear that your Monstera has been thriving with new leaves! The brown spots could indeed be caused by a few factors, including excessive sunlight, improper watering, or even humidity fluctuations. Before using any fungicide, it's a good idea to try adjusting your care routine:

1. **Sunlight:** Ensure your Monstera is getting the right amount of indirect sunlight. Too much direct sun exposure can lead to brown spots.

2. **Watering:** While you're using a moisture meter, also make sure the pot has proper drainage and that you're not overwatering.

3. **Humidity:** Monstera plants prefer higher humidity levels. You might consider misting the leaves or using a humidity tray to create a more humid environment.

4. **Inspect:** Examine the plant closely to rule out any pests or signs of infection.

If the issue persists and you suspect a fungal or bacterial infection, then using a copper fungicide could be considered. It's generally safe for plants, but I recommend conducting a patch test on a small area first to ensure your Monstera doesn't have a negative reaction. Best of luck, and I hope your Monstera recovers beautifully!
@JungleDreamer Thank you so much for all the help I really appreciate it! 😊 I’ll closely watch all those things!
@Madelinewagnaar It doesn’t hurt to treat your plang with copper fungicide as long as you follow the instructions.

Many of us are seeing spots like this and it’s often due to the high humidity and water droplets forming on the foliage which won’t evaporate as fast as we would like them to.

Monitor your humidity and lower it. It’s super hot right now so humidity is naturally high even indoors. Try purchasing a gentle fan near your plants to increase air circulation and help the droplets evaporate faster.


I’d worry if I saw several leaves yellowing. You can allow your Monstera to dry out longer if you have it in a deep pot. It’s a vine and it prefers more air than water. Always remember that your plants will grow between waterings so they won’t perish with a day or two in dryer soil unless they are outdoors in the hot sun. Try not to overwater which will bring on fungal and bacterial infections. If you use rainwater, know that there are tons of pathogens in it that will change your plant’s appearance and not necessarily cause it harm unless you allow your roots to sit in muddy water when they don’t necessarily like it. Most do but not Monstera.

Go ahead and treat it as you feel you need to and be on the side of maintenance/prevention. Be patient. If it doesn’t spread, you’ve got it under control. Best of luck! 🌿
@AnthuriumQueen that is very very helpful thank you so much! Colorado has had some wild humidity changes this year so hopefully that’s all it is
It is most likely a fungal problem caused by a watering issues I would treat with copper funcide and go from there
@Michelle5986 thank you 😊
@Madelinewagnaar your very welcome hope it gets to feeling better soon