I was sprouting some French marigolds and noticed some spots on the leaves. They didn't look good, especially since one of the plants didn't get them. I looked them out on the internet and figured it was some kind of leaf spot (though I don't know anything beyond that). Figuring it might have been because of being overly damp, I planted a second set except I started them outside (also in a seeding tray). I just checked them today and it looks like the cotyledons are starting to show signs of the spots along the outer edges though I won't for sure for a couple days. None of the other plants I sprouted with the same potting mix are showing any problems like this. The variety is Disco if that helps at all.
So a couple questions:
- What are these spots and are they a problem?
- What can be done to prevent them?
- Should I give up on them and root them up?
- Will I be able to reuse the potting mix, or should I get rid of it too?