KC Gardens

Fertilizer problem with bearded iris?

Two years ago I divided several clumps of tall bearded iris and moved them to a new bed that I prepared. Last year they were spectacular. This year only a few bloom stalks developed. The foliage appears to be healthy. I did lightly fertilize them this spring with 10-10-10. Was the fertilization the problem? I don't think they are planted too deeply as they did well last year. Additionally, the stalks that have developed don't stay upright and require staking. Is this normal? - Steve -