Baby Lettuce

[cdbva]

I'm growing lettuces for the first time this year. I love the spring mix or baby lettuce mix (same thing?) that the store offers.

So if I want my own baby lettuce, that means cutting it while it's still young, I assume. Before it's officially "mature?"

I bought some plants -- Arugula and Romaine -- and after a week, the leaves are already the size of the ones that come in the bag. The plants are still smallish. How do you know when to cut?

Christine