My Romaine plant is gro ing well but is developing brown edges on some of the leaves.
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Hello @sullivan
The garden and plants seem to be thriving!
The lettuces develop brown edges when they start to age, so it is best to harvest the lettuce now 
Lettuces can be harvested from 3rd week of growing until 6th week, so the ideal time to harvest in one go is 35-42 days.
Sometimes the leaves degrade if the temperature is too high because lettuces usually like colder temperatures (18 - 23 °C / 64 - 73.5 °F).