Seedlings that refuse to develop

Has anyone else had this problem?  I started some hand-collected seeds of a 
Delphinium native here in western Oregon (probably D. trolliifolium, but 
I've misplaced my identification book).  They sprouted happily after about 
three weeks' sratification.  Problem is, once they got to be about  2-3 
inches tall with nice big juicy-looking seed leaves, they completely 
stopped growing and developing.  For two months they continued to sit there 
happily dressed in only their seed leaves, while I tried everything I could 
think of to get them moving.  I had them in sterile potting mix, and 
thought they might be missing some obscure nutrient or symbiote.  I first 
tried giving them some dilute fish and seaweed emulsion.  When that didn't 
help, I tried transplanting some to a pot with a bit of unamended garden 
soil (for the microflora), some homemade compost, and some peat and perlite 
to lighten the blend.  I've given them assorted levels of light, indoors 
and outdoors, and assorted (reasonable) temperatures.  In the last few 
weeks, they've started to die but I still have some left. There are no 
apparent insects or nibbles -- my best guess is that they die because their 
seed leaves are getting kind of worse for wear and tear after three months. 
Does anyone have any suggestions on how to get the remaining plants to 
grow???  I grow an awful lot a lot of stuff from wild-collected seed, and 
I've never run into anything like this before.

Apologies to those who also read the CA-natives list, where I posted this 
question a while back.

-- Susannah the mostly-lurker
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