I had always read of the plant being invasive, but here in RI it didn't appear so for me. I ordered some from a fragrant flower internet seller that was going out of business and was thrilled with it when it arrived and ultimately bloomed. It really took off last year and I had masses of pink and white fragrant blossoms. Then this spring it started to come up and one by one each plant started to disappear until all were gone. I'm thinking a deer got at them, but they had never touched them before.
If anyone has any seed, I'd be appreciative if you'd DMail me. Thanks! I am really missing this plant. :(