My siberian iris (the woman who gave them to me had dug them up in the Ohio bottoms and she called them "swamp" iris) have generally bloomed with long bloom stems - this year the foliage almost hides all the blooms and there don't seem to be as many blooms. We spread 10-10-10 lightly over the entire garden in March? the spring was unduly early in KY, they bloomed a week earlier than in past years? do they need dividing? Do they need to recover from last year's division? Suggestions Please.