I grew cut and come again types in seed trays last year and they were okay. Probably didn't perform anywhere near as well as plants in the open, but provided up with plenty of leaves during the summer. I did half a tray, then once it was through, sowed the next half, then when it was through, did another half a tray and so on. I didn't feed 'em :o, but I am a bit of a slacker like that. I can't see why it wouldn't work. ;D