It's an annual so not at all surprising it did not overwinter!! But it not overwintering does not mean it is unable to toss its seeds far and wide.

If they did set seed, they did not germinate.Our winter was mild so maybe there was not enough cold.

Where are you located? Here in the PNW we have very mild winters compared to much of the country, yet this plant is considered a noxious invasive weed. They set and disperse their seed very freely.

I live in southern mississippi.Often annual die out in our extreme hot summers usually with a very long dry spell.The impatiens I had were ordered plants.They had small blooms but never reseeded.

I think they could potentially be invasive in Mississippi. I dreamed about growing I. glandulifera for years, looked for seeds for years, then, finally found some. When I actually grew them out I wasn't impressed. They looked rough and unruly. The flowers were beautiful though. I much prefer I. ballfouri which is also from the Himalayas. I. ballfouri is shorter, much neater looking with pink and white blooms. I often find seeds by doing a Google search. A lot of the time you can find hard to locate seeds on Amazon and EBay. You need to be careful that you don't let these aliens get into the native ecosystem. Impatiens glandulifera has wreaked havoc in the U.K. and Pacific Northwest.