I have young plants who develop leaf problems. They seem to go branch by branch and the plant never amounts to anything. This just started a month ago and is getting worse.
it looks like the edges are turning yellow so maybe they are too close to the light and also the leaves look real dry so maybe you should think about watering till u get a good run off
It starts with the lower leaves so I don't think it's the light, also I'm growing hydroponically so watering isn't the problem. I'm looking at adding some magnesium. I use Sensi-Grow and the label says I shouldn't have to add any, but I'm using a very low concentration of fertilizer so that's worth a try.