Yes, sort of. It is more harvest as soon as it is big enough than wait to harvest just before the flower.
Leaf lettuce like your varieties can be harvested by cutting the whole plant an inch or teo above the ground. It will grow back if it is happy (cool enough weather, enough moisture, enough food, ... ). I prefer an alternate method - picking one or two outer leaves per plant every few days.
It will stay happy longer in light shade or in a pot that can be moved into the shade on warmer days.
Leaf lettuce like your varieties can be harvested by cutting the whole plant an inch or teo above the ground. It will grow back if it is happy (cool enough weather, enough moisture, enough food, ... ). I prefer an alternate method - picking one or two outer leaves per plant every few days.
It will stay happy longer in light shade or in a pot that can be moved into the shade on warmer days.