Wisteria seedlings

I received some wisteria seeds in the fall and planted the seeds and they have all germinated. I was wondering if/when I should separate the seedlings into their own pots.

If you can do it without bare rooting and disturbing a lot of the roots you can do it now

Rule of thumb is that seedlings are in general tougher than big trees

You can do it now even if you do disturb the roots. You will probably find most just have long vertical roots. I would normally root prune seedlings like this to encourage lateral roots. Seedlings are definitely more resilient than older trees.
Note that wisteria are very slow to mature. Expect to wait at least 7 years for first flowers. One of mine took 18 years to produce first flower bud.

Here in the middle Atlantic states down into the southern U.S. wisteria is an invasive destructive weed. It grows wildly here. If it is planted near a structure, it will eventually tear the structure down. The further north you go, the slower this plant grows and it has to be coaxed and coddled up north.

Around here, all you have to do to get a vine is throw a piece pruned off a larger one into the woods and wait. BIG pieces will root with no problem, given dense rich topsoil, moisture and a little heat.

I always find it amusing when people actually grow these on purpose from seeds or buy seedlings...as said before, those take a decade or even two to produce flowers....but I can go out and dig big ones up...These are growing under my parking deck at work. There are a hundred more under there...

I have root pruned and separated all the seedlings into their own small pond baskets. Except for 2 they had more lateral roots than I was expecting. I am definitely in for the long haul on these. Thanks for all the information and the pictures.

Mine actually came as one of the seeds in a "How to Grow Bonsai's" kit I got for Christmas. They give you the cups and fertilizer and tell you what to do and all that. And this was one of the flowering trees and the other was the "Flame Tree". I actually gave the Wisteria to my Mom to try and grow. She picked it out as her favorite. And she is actually having a hard time getting it to grow. After she planted it I looked the tree up and read how long it takes to flower. Yeah, I was a little disappointed and kind of wondering the same thing. But over here we never see wild Wisteria's. It's funny like you say when they are growing all over the place where you are. And yet so rare and precious here. That's just how it is. I'm sure we have some trees that you would never see in a life time and would love to see as a Bonsai growing.