Are these bearded iris' with nearly surface rhizomes? I just don't have much of a moss issue here in my desert-y existence. I think I would be tempted to put something in a spray bottle and carefully spray just the moss. Something like bleach? I just don't know. I hope someone with more experience comes along with a better suggestion for you.
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~Tina


Drama Free Zone.
What every gardener loves the most, Begins and ends in rich compost. (Tina)