weed control among irises


I have 2 questions about weed control. Does anyone know if it is safe to 
use a preemergent, like Dacthal, in an iris bed?  Also, I am thinking of 
broadcasting the white Dutch clover in the iris bed for suppression of 
weedy grasses. Has anyone ever tried this, or see any reason not to 
do it?  Many thanks, Judy Sylvester zone 5



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