Sorry to hear that, David.
Just last night I was reading someone's description on how to grow an unusual or rare plant:
If you buy an XXX and are somehow lucky enough to keep it alive, you will notice it is, well, singularly in want of solitude. Most plants aren't communicative. They live, grow and die without expressing themselves to you. XXX are unlike all other plants I've ever had. One day, you walk away after carefully observing the tree's progress and realize it did not appreciate your looking at it, so you start pretending you're looking at something else while casually walking by. I'm not kidding or nuts. Other owners have reported the same. Perhaps this is why XXX enjoy the solitude of craggy hillsides in lonely inhospitable deserts. I think it gets nervous or something. You'll know when you upset it as it will start dropping leaves. DO NOT look at it too long. DO NOT move (jostle) it about. DO NOT change its watering or fertilizing schedule. Only repot it once every several years when absolutely necessary. Leave it alone!
The good thing, however, is that for as temperamental as this tree is, it is also very forgiving and will bounce back if you remedy whatever it is your doing that upsets it.
I've often told people not to fuss over their rare or treasured plants, this lady takes it a whole 'nuther step! Gave me a good laugh.
Maybe you looked at your seedling too long.
Susan
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Susan B
Lakeside Callas
www.lakesidecallas.com