Why is celery sometimes bitter?

I bought celery to munch on but it was so bitter I chopped it up and froze it to use in soups. Never had this happen before.

Answers:
Here are some tidbits I found:

"In addition, evaluate the celery to ensure that it does not have a seedstem--the presence of a round stem in the place of the smaller tender stalks that should reside in the center of the celery. Celery with seedstems are often more bitter in flavor."

"Improper environmental conditions, primarily high temperatures at maturity along with stress conditions such as drought or low fertility can cause off-flavored celery. For maximum quality celery must be grown under suitable environmental conditions and a constant level of available moisture."

Other answers:
nope i have never had bitter celery before
nope i have never had bitter celery before
Sorry never had this happen before.
Maybe the celery was abit old.
Or Maybe it was abit young & hadnt matured
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