Onion seedlings yellowing and falling. Help!
First time growing onions from seeds. Planted about a month ago and had decent germination. I'm growing Redwing and Yellow of Parma. They are under fluorescent lights, 16 hrs a day, in a 70 degree room. They seemed strong until about 3 days ago when the tips started drying and yellowing. Now its about the top 1/4" and they've begun falling over. Any ideas?
Help is much appreciated.