I've read that too, but I've only seen it here and there in small stands. It just doesn't act invasive where I live in Ulster County. I even planted them by my house from seed. I tried to coax them to naturalize, but had no luck. So I've settled for linaria (money plant) instead. Now that plant can be invasive! But both are so beautiful.

Sounds like a great plant just for the smell, never mind the critical deer resistance ... do you think it can outcompete the darn garlic mustard that is plaguing every spot in my yard that gets more than an hour or two of sun?

It is certainly competing with garlic mustard in my woods and swamp. There are big drifts of it blooming wherever it can get some sun.

I just posted about this in the hummingbird forum. I dug up one stalk of this plant by a roadside construction site about 5 years ago. It has become sooooooo invasive in the small garden I put it in - even coming up in teeny tiny holes in the driveway next to the garden. While I do like the flowers on this plant, I would never ever plant it again!

Out walking the dog again this evening and the sweet rocket in the wood was playing host to a monarch butterfly. It sure had plenty of food available.