fertilizer

Today while digging irises up for shipping, I noticed granules of fertilizer still in the ground that I had used last fall when planting irises.  With all the rain we had this past winter,  the fertilizer had not yet broken down.  We had a beautiful bloom season after getting a late start, but poor increases.  My thinking is, the irises didn't get any fertilizer.  
 
Would appreciate any input as to why fertilizer would not break down.  We use a 6-20-20. 
 
It is nice to be back online and read everyone's messages.  Thanks to John for keeping the communication lines open and for the insight to start the new iris-talk.  Thanks, John.     
Lora L. Masche
Forquin Mountain Iris Garden
21643 Shake Ridge Road
Volcano, CA 95689
(209)296-4436
http://welcome.to/irisgarden
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