Plant ID help please

It germinated.  Anyone recognize it or have any ideas?

It appeared in a container filled with mostly a planting mix soil substitute, perlite and peat and grain hulls.  It has been here for years.  I reused the mix although I don’t think it has any life or fertility.  I’m not sure where the seeds came from but there are several that look like the aame plant.

These photos are of 2 different individual plants, but I think are the same genus and species.

Clarification:

The planting mix has been here in the place I bought summer of 2024.  I am guessing it is 10 plus years old.

The plants germinated this season

...maybe a knotweed or smartweed?
https://en.m.wikipedia.org/wiki/Polygonum
https://en.m.wikipedia.org/wiki/Polygonaceae

I think Judith has the right family to investigate.

yep, knotweed of some sort.

Thank you, Judith, Joylynn & Greg,

My plant id app says it's lady's thumb. It also goes by names with the words smartweed and knotweed in them. It is a non-native, invasive plant.

Green Dean's take on Smartweed. And here is his take on Lady's Thumb.

I have several weeds in this family in the seedbank. I just call them "Tall Polygonum" or "Prostate Polygonum" and throw them in the soup pot. Others may want to be more specific before ingesting... Mine are rarely slightly spicy. Just kinda green tasting.

We only use the leaves.