iris flowers not opening

Can anyone tell me what is happening with this iris? I grew it from seeds, 
from SIGNA’s seed exchange, in theory I. chrysographes. The plant is about 4 
years old now, and was shaded by a fern for 3 years, and has not flowered 
until this year. This year, released from shade and competition, it sent up 
numerous buds, which have failed to open. The buds are withering away, and no 
flowers have appeared. There are no signs of disease (except on withered 
fading buds), and the rest of the plant looks healthy. 

What is going on? 

Kathleen
Pacific NW coast





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