There's definitely a big difference in bolting time for one lettuce or another. The best one I have found so far is a "Freckles" type lettuce. There was one called "Cherokee" I read about but haven't grown, supposed to withstand heat and drought. Even we can have bad times for lettuce here if it happens to get hot and dry for a spell.
I planted some of my romaine types for heads in the greenhouse. Really impressed with a new one called "Sherwood" billed as a "mini Romaine". It's super dark green and very upright with those thick juicy ribs already, the others are more spreading and softer buttery type leaf. I hope it turns out to be as good as it looks. Will have to save seed if it is!
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