this post was submitted on 08 Apr 2026
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Yellow leaves on the bottom of the plant is the most common sign of nitrogen deficiency.
This can be caused by lack of nitrogn availability or other things limiting the uptake of nitrogen into the plant.
Overwatering: too much water can create anaerobic conditions (No oxygen). Bacteria in the soil convert ammonia and nitrate to N2 gas.
Any disease effecting the root. This includes fungal and bacterial root rots. Letting the pot dry outcan help reduce the pressure.
Other species that feed on the roots. Fungus gnats, nematodes, and many more things can feed on the roots.
This is correct. Yellowing leaves starting at the bottom and working their way up is nitrogen, which is a mobile nutrient and can be moved from old leaves (bottom) to new (top) in order to support growth.
Root rot was suggested elsewhere in the thread but that typically presents with browning of leaves with no specific locality.
Non-plant guy here. Is that upward browning effect universal to most houseplants? If so that is a very cool fact
No expression is universal across plants. Genetically they are too varied and adapted to too many environmental conditions. So the expression of any issue, logically is varied depending on the plant species background.
That's why anyone that works with or knows a lot about plants uses qualifying terms like "usually, generally, most common, etc". It's always an educated guess.
Browning of leaves could be a sign of root rot. It also could be a sign of salt buildup in the soil. Insect feeding on the roots, different nutrient deficiencies/excesses, herbicide/pesticide damage, or even reactions to temperature, light and humidity. Yeah....
Semi-plant guy here. When your roots rot it would look like your not watering the plant cause it can't suck up water due to damaged roots. I think that's what happens.
Root rot happens due to lack of oxygen, specifically, which is needed as part of nutrient transport, fwiw. As water is absorbed in a plant, it recedes within the soil. This causes air to get pulled in which delivers fresh oxygen to the root system. Frequent over watering impedes this process and causes the roots to necrotize, which helps feed fungus and mold in the soil, which further erodes the root system and exacerbates the rot.
Root rot usually presents as multiple problems at once since, just as a rule of thumb. This image however was definitely nitrogen. Super common in elder big leaf and younger fast growing plants.