I realized you posted 2 weeks ago. Just saw this today. I wonder how it goes. If still nothing, I think it's the seeds. I tried NG impatiens for the first time this year and had no problem in germination. The variety is called "Florific". Actually I think NG impatiens seeds are easier than regular impatiens because they are bigger. I use tofu container, peat moss + perlite, and salad box as the "dome". Don't have heating mat. Just stack the salad box near hot air vent. No watering until the seeds sprouted. The temperature was around 70-72 in the day and went down to 65. So it's definitely on the cold side and I assume warmer setup they should come out faster. Anyway, at 2 weeks my seeds have

sprouted, not all of them but majority of them. I don't think they require light because I put my seed trays at the bottom of the stack. In the picture they are 3-week old. Hope you got the seedlings up by now. Otherwise it's probably a little too late to start over.

Both require light in order to germinate. Studies about impatiens are interesting....they seem to do best when exposed to light for a couple of days, just to break the dormancy, then can be covered very lightly with a fine textured medium.

I treat most tiny seeds the same: Begoinias, coleus, impatiens, lobellia by starting them in a clear covered container with moist soil and seeds sprinkled on the top. I don't cover any tiny seed.

The ones I started this year sprouted but they grew very slow and didn't take well outside this week despite the relatively warm/ seasonable temps. I guess it is still too chilly/ and root growth was too poor in coconut based soil. Anyways I took some cuttings off of the a few and hoping they root.

--

How are yours doing now?