Volunteer Impatiens in zone 4
How low a zone can impatiens reseed?
This year I have discovered impatiens (walleriana variety) re-seeding themselves in my Minnesota garden. I have seen at least about 3 plants so far.
This was even after the harsh winter of 2014. Granted they are somewhat sheltered being in a downtown area and against a huge building. They may or may not have experienced the -30F, but they were definitely frozen.
I am quite surprised. Last year I had quite a show with i. walleriana, but decided not to plant them this year because of the downy mildew.
But some time in early July I started seeing volunteers. I let them grow and sure enough the flowers look like the ones I had last year.
I thought these were more tropical plants (or at least requiring temps well above freezing), so seeing anything, even seeds surviving is quite a surprise to me. Anyone else have experience with volunteers?