Highya BaffledBirdie,
I know everyone has given you their take on your Roxette problem. Only you have all the info on your grow; temps, nutes, timing, etc. When the pine bark was discussed before, I thought it would change the environment for the seedling too much. After thinking from that perspective, looks like the soil is acidic enough to lockout the nitrogen. It's the only thing I can think of. The wrong nutes wouldn't stunt her like that, I wouldn't think. But, food for thought. Only you can mull it over for an answer, lol. Cheers, Birdie fair