New World Little Gardens

I have seedings of different ages or stages... not fR on the growth side, can i plant the same species together in one pot.

Yes, you can plant your seedlings of different ages in the same pot, as long as you allow enough space between each one for it to fully grow and mature or else you will have to re-pot/re-plant some of them again. There's more info on how to grow and raise each of your Little Garden seedlings here.