My dad's Tomato plants are 4 weeks old and now some of the leaves on the plants are turning yellow. He started these from seed and is growing under florescent lights.
The problem started in his German tomatoes, but now seems to affect others like his celebrity. The problem started with the lower leaves turning yellow. None of the plants have died yet, but I'm wondering what the cause of this is, and what can be done to treat it.
I'll post photos so you can see the plants.
If anyone has any ideas please let me know. Thanks for the help.