When you asked me this question I ignored it for a reason. I wanted you to explore and find out on your own. So here is what I will do. I will list the common reasons for a yellowing plant and YOU find the reason:
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Pests
Look your plants over carefully for pests or signs of pests. Check the bottom and top of leaves. Check your soil. -
Watering
Overwatering and under watering are probably the most common reason for yellowing plants.
Soil compaction can also be a reason. -
Nutrients
A lack of nitrogen or a nutrient lockout can cause plants to turn yellow.
PH iimbalance can cause this also, I showed you how to do a runoff test but I bet you didn’t bother to check. -
Stress
Temperature fluctuations as well as excessive light can affect your plants in a negative way. -
There are several other factors that can cause yellowing like Root problems and diseased plants.
But asking others won’t help you in this as there are many factors. So get off your ass and look into it. No one is going to give a crap as much as you and if you are to lazy to do the work then your plants deserve to be yellow…………