For your reference: Lettuce belongs to leafy vegetables. Lettuce is divided into oil wheat vegetables, lettuce and lettuce (loose leaf lettuce, catching lettuce), lettuce and so on.
Please look at the picture
The picture above shows the growing oil wheat vegetable.
The picture above shows the growing lettuce.
The picture above shows the lettuce before it is sold.
The picture above shows lettuce ready for harvest.
Take lettuce as an example.
The picture above shows lettuce in bloom.
The picture above shows the late flowering stage of lettuce.
The picture above shows lettuce seeds before harvest.
The picture above shows the lettuce seeds after harvest.
This shows that lettuce will bloom, and it will produce lettuce seeds.
Eggplants and melons will bear fruit. Please look at the pictures.
The above picture shows the picking period of cucumber. The edible parts such as cucumber, tomato, eggplant and bitter gourd are fruits.
The edible part of lettuce is leaves or fleshy stems.
As far as I know, I hope you can wait for other netizens to come and answer these other explanations, or check related articles online.
reference data
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Thank you for your question.