Do you want to save them? Plant them? If so how long until they can go out? In your zone I'd guess a couple of months?

You can pinch them back so side branches will develop - find a node on the stem about 1-2" above a leaf and snip the stem 1/2-3/4" above the node. They will keep growing and vining and you have to keep pinching new stems back. But they could also use much more light so that they won't be so leggy. Best as I can tell from the pic it looks like you have an internode length of 3+ inches there and it should be no more that 1-1 1/2".

Or you can just rack it up to a lesson learned about starting things too early and toss them to free up the soil and containers for use at the proper time or for something else.

Dave

PS" and yes, most consider them invasive weeds that once they get established in an area are almost impossible to get rid of. ;)

Thx Dave. I had to take them from under the lights as I had petunias in the same flat. I just stuck them on a tv tray to continue proper light on other things.

The base stems are around 3mil thick. I assume healthy other than the lack of proper lighting....Jack

Just checked the internode, about 1.5 .