I'm leaving a head of lettuce to bolt, so I can collect the seeds from it. I love how they look when they're working towards flowering, though! They get taller and taller and the leaves stretch apart from each other and then, poof! A little flower appears on top.
Mine is at about 25", currently, and growing up noticeably every day.
Here's a picture of it next to a 1.5 gallon jug:
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7 years ago