Bought the wrong (invasive) comfrey… What would you do with it?

Ok so I’m in upstate ny (the catskills) zone 5b.

Earlier this spring I put in a seed order (fedco, bc my farm manager gave me a coupon code) and decided to add some comfrey bare roots to the order.

Anyway, I did NOT order Russian / bocking, I ordered regular Symphytum officinale. 3 plants.

I planted one in a area that’s currently overrun w goutweed that I’m currently digging out said invasive and turning into a native Wildflower garden. One next to an elderberry, also surrounded by goutweed. And one in the area on the edge of my garden where I have black raspberries and clover

Then I realized my mistake and dug all 3 up and put them in a pot

Anyway my question is… Should I just kill it?

How hard to control is it? If I put it in an area I regularly mow the borders of, and just use it for chop and drop or salves, will if be a problem? How far does it spread from seed?

I’m thinking maybe I’ll grow it in a metal planter and just keep the flowers from going to seed, and grow a small amount for salves

But I’m already in wack-a-mole situation w other invasive and other endless problems on the property (neglected for the past 3 decades by my parents and abused for the prior 3 decades by previous owners) I’m worried about adding something new to keep up with to an ahready endless list.

Should I just burn the plants now and get sterile comfrey??