Allium + perennial question
Seeing all the great pics of alliums incorporated into perennial beds means I have a need some more of my own. Reading on bluestone, it says allium multiply rapidly. I have only planted allium in one spot and it has returned for two seasons, did not bloom this season and has not multiplied at all. My perennial beds are packed, I want to interplant with allium but not if its going to "rapidly multiply". How have you addressed this problem and does it really spread that fast?