I agree with floral_uk; it does look like loosestrife. here in Oregon is is a noxious weed that carries disease. Without being able to see it up close, it's tough to be sure. It is a possibility that it might be Epilobium (fire weed), but the shape of the inflorescence leads me to believe it's Lythrum salicaria.

Floral, you are right to warn gardeners about using any forms of purple loosestrife here (horticultural as well as wild) in gardens. Perennials.all, I do have a good idea of the distribution of wild purple loosestrife in Ontario and elsewhere in North America. I think you missed the point of my post. The 1992 Manitoba Study took plants of the horticultural cultivar 'Morden Pink' and planted them near a river and adjacent to wetlands, both of which had wild purple loosestrife present. The furthest any of the cultivar plants were away from wild purple loosestrife was 200 meters. 'Morden Pink' was thought to be sterile. It was presumed that the ability of plants of the cultivar to self-fertilize themselves, in the way the wild type does, had been bred out of them; namely that they were "self-incompatable". In fact, it was found that the cultivar plants lost their self-incompatability (hence sterility) in these locations in the presence of the wild type and, like the wild form, produced very large numbers of seeds. Some gardeners then wondered whether there was any evidence for sterile purple loosestrife cultivars losing their self-incompatatbility in garden situations, when the gardens were located nowhere near wetlands nor wild-growing purple loosestrife. Some simply dismissed this question out of hand. Either you believed in "the purple plague" or you didn't. Personally I'm more impressed by evidence. Are the researchers correct in extrapolating from purple loosestrife cultivars placed in research locations to those in average gardens? Over the years, I've seen almost no relevant evidence presented by gardeners. My post presents such evidence; that is seedlings which have been produced by one plant of a horticultural purple loosestrife cultivar that lost it's self-incompatability in a garden.

Thank you for the quick response! I believe that is correct as well after reading up on the Elderberry bush. I'm learning lots of good knowledge on this forum. I will soon post more updated pics of the original plants I was trying to ID.

Not Nicotiana. That doesn't have opposite foliage. Did the seeds look like Nasturtiums? They're pretty unmistakeable. Also what was the source of the seed?