I’m growing about 50 creeping thyme seedlings to plant as a groundcover. Most of them look pretty good, but a couple of them seem to have tip dieback like the picture below. Now, all of them are sprouting side shoots and I presume will end up just fine, considering they creep along the ground anyway.
My suspicion is maybe too much moisture? I backed off on watering, but the difficulty is that my potting mix (Miracle Gro) basically goes like this:
Day 1 - too wet
Day 2 - too wet
Day 3 - too wet
Day 4 - Goldilocks
Day 5 - wilting
A bit hard to see, but the one in the center is one of the ones I’m talking about. Only about four of the seedlings are actually doing this, but a few do have a little bit of leaf desiccation of some sort going on.