Evening Primrose 'Siskiyou' - invasive?
DH and I were at a great garden center yesterday and I was picking up a few "fill in some empty spaces" plants. I saw an Evening Primrose "Siskiyou' and got one to plant on the west side on my house where I wanted something short with pink. After getting home I read online that it can be invasive. So, what do you advise? Plant it with a large nursery pot around it to stop it from spreading? Plant it off on it's own somewhere where I don't care if it takes over? I'm in southern Maine, zone 5/6.
Also, is all Evening Primrose invasive? I have a yellow one elsewhere in the garden, it's new also.
Any advise is appreciated. Thanks.