keep the sun off? You mean celery likes shade
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No, they like full sun....
Now i'll try and explain myself a little better:-)
You know how when you buy celery, it is white at the base of the stalk? Well that bit is covered from the sun. Some people use mulch piled up high around the
plant. I have cut the top and base out of a milk carton and used that. The
plants leaves have to be out of the cover, so the
plants can photosynthsise, just the stalks get covered. If you don't, they will be greener and not as tender.
Does that make sense?