Gardeners - What to Do with Green Bean Plant in a Cup - It's Actually Growing?

Go ahead and put into a larger pot. Like a 10 or 12 inch pot. You can keep it indoors for another couple of months to keep an eye on it. But if it is in the window and getting alot of direct sun, pick another spot that it will get just as much sun. Try not to over water. Let the soil dry out in between waterings. Water every 3 to 4 days, but don't go longer than 6 days.
You can rig up a something for the vine to grow into, because green beans are a vine. They love to cling and wrap around and move.
My kids have loved growing different plants. At one time between inside ivy's and bamboo plants to outside shrubs and trees I had over 5o potted plants! I love it!!
Good luck and HAVE FUN!
Blessings!
D.

I would put them in to a planter(s) with moisture control soil (I use this for my potted veggie garden). You can keep them in the house until you are ready to replant outside. Find a sunny spot or if your current spot has the room keep them there.

Plant it outside after all chance of frost is over.

In the mean time you can put each one in a bigger pot and enjoy seeing them grow.

Good luck to you and yours.

I'd pot it. At best it will continue to grow and you can move it out doors in the spring, at worst it will die, which it's bound to do if you don't pot it.