I planted 4 pots with purple fountain head in each. I do not plan to over winter these. Will the seed heads on these cause this to become an invasive plant in my garden?
Purple Fountain Grass
I had to do some reading; this is what I found. If you are north of zone 8-9, it is unlikely to survive the winter. It sounds like you have the cultivar "rubrum". One of the parent plants is invasive but rubrum rarely produces seed. So you won't have a problem.