Answer: The leaves could be yellowing for a number of reasons. Too much or too little water can cause yellowing. If they are new transplants, they could be suffering some shock from the transplanting, and from adjusting to their new home. If the plants are in containers, they could be suffering from lack of nutrients, if you haven't fertilized them and/or if you have poor soil. If the weather has been very cool it could be a reaction to that. Finally, it could be due to disease. If the older leaves are turning bright yellow, then I would check to see that you are keeping the plants evenly moist. If they have gray or brownish spots, you may have some type of disease problem. Growing in a Topsy Turvey container can contribute to water stress. Be sure you water thoroughly and then let the soil dry out a bit before watering again. Good luck with your plants.
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