Kate unfortunately its survival of the fittest with seedlings try putting them in a bit mor sun morning or afternoon keep them out of midday sun it wont hurt carefully lifting one up and have a look at the roots also b good if u can put your location up with your name

That's strange. I had my location in my profile before, but it has disappeared. I am in Honolulu, HI.

That's sad Peter :( I am a novice so the casualties of seedlings is new. Still, I do wonder if I am doing something wrong. I will follow your advice and lift them up to check out the roots.

I just realized that it is only the Thai Soco Chada Petch seedlings that have yellowing leaves. What do you think Peter? Am I watering too much? Not enough? I was away for a week and I set up a watering contraption that did keep the soil moist.