HI druss. Wait till you think they can cope outside. I let 1 go out and it died cause it was too small, and got eaten. Im gonna keep the rest in till they hit about 20 cm. I would plant em in big ass pots indoors then take the pots outside and then burry the pots so then you can get em in on 12/12 when YOU want. but if you cant be arsed to do that then plant the whole medium in the ground.
Good luck

P.S REMEMBER TO THINK ABOUT THE SLUGS AND OTHER THINGS THAT CAN KILL YA PLANTS RABBITS LOVE WEED