Forget-me-nots

Forget-me-nots

I'm a new gardener with a new garden - we bought a brand new house in 2003 which is built on what was one time a corn field. Hence no plants at all. We now have grass in the backyard along with some flower beds but it still looks pretty boring. I was thinking to put forget-me-nots in one of my flower beds and read that they often self sow. I'd like to have them year after year without replanting so I like self sowing part. On the other hand my sister-in-law who has an old garden (30+ years) complains that they grow everywhere in her yard and she lost control over them. My question is - how do you prevent them from self sowing? Oh, and I'm in Zone 5 if that helps.
Savory Chicken Crescents

Savory Chicken Crescents

My room.

My room.

Nice photo of… something

Nice photo of… something

Just One

Just One

Cobaea scandens

Cobaea scandens

New piece….

New piece….