If going off just that image of the leaf, it looks like too much water. They prefer to be kept a bit dryer than too moist
Thank you that what i thought
What your seeing is interveinal chlorosis. Essentially it's a nutrient deficiency causing the yellowing of your leaves in between the veins. You'll need to identify if it's older leaves or newer leaves dying first. If older, it's likely manganese or magnesium. If it's younger leaves, it's likely iron.
It's worth noting that you also have necrosis around the outsidea of the leaf as well which is typically a sign of other deficiencies as well.
The easy fix is to just give your plant a little fertilizer. Should start to help after awhile. Your going to unfortunately lose those leaves though.
Edit: I see that everyone is commenting that it's a lack of water. I don't think so. A lack of water will cause the veins of the plant to yellow before the rest of the leaf. In your picture, the veins are green. To me, that means that your plant is pulling nutrients from that leaf to use elsewhere. It's killing that leaf (by pulling nutrients) to keep the rest of the plant alive and healthy.
I disagree with you.
Interveinal chlorosis (yellowing of the area between the veins) usually has the veins remain green all the way to the leaf margins.
Although the center vein is still green, the veins in most of the leaf are yellowing.
On the lower leaf, this is yellowing pattern is usually caused by nitrogen deficiency.
Nitrogen deficiency can be caused by three things:
Lack of available N in the soil.
Solution: add some fertilizer.
Overwatering the pot causing anaerobic conditions and denitrification (conversion to NO2 gas).
Solution: allow the pot to dry out more and add fertilizer.
Salt accumulation in the pot. This can inhibit nutrient uptake from the soil by blocking the mechanism for transport.
Solution: leach the pot by 5+ gallons water through the soil and add fertilizer.
Thank you for this very scientific answer.
I think it might have started with younger/small leaves, some of them became fully yellow. (https://freeimage.host/i/HyL5TB9)
But only the older ones have the necrosis.
There was a lack of water during hollyday, then too much water to compensate. But it started showing small signs before that. I'll try the fertilizer
Your plant is also stretching. It needs light.
First and foremost get it in front of bright, indirect sunlight and get it some liquid fertilizer. Honestly anything will help at this point. Make sure to dilute fertilizer or you will end up with nutrient burn.
How often do you water it?
Usually about once a week when it's dry, and just some spray every 2 days...
But there was a heatwave and maybe I watered too much at once because of that
Can we see the rest of the plant? What does the soil look like? How much sun is it getting? Was it transplanted recently? As others have said Monsteras do like to dry out. Water just the soil once every week or so when soil feels dry, every two in slower seasons. Do not spray the leaves, make sure when you water you are giving it enough to encourage deep roots.
Image upload seems bugged (403 error) so here it is : https://freeimage.host/i/HyiNIqJ
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