Connie- what about space??
My lettuce right now is easily 12" across. Looks like cilantro, maybe? That's quite a tall plant if allowed to flower (for coriander) with quite an extensive root system. Although if you ate all of these things really early and young you'd be ok, although you'd have to continue to replant plugs.
That would probably be a good idea, especially in a cooler climate where you could get greens throughout the growing season.
