Halacha: What Blessing Do You Say on Celery?

On celery,we say the blessing "Ha'adama" (first blessing)

At the end of the meal, say "Borei Nefashot" (concluding blessing)

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The measure of consumption to obligate the concluding blessing (from "Halacha Yomit" based on the rulings of late Rabbi Ovadia Yosef z"l):

For anything a person eats, they must say the "first blessing", such as the blessing "Shehakol" or "Ha'etz". Even if you consume only a little of the food, you are obligated to bless it, as long as it is consumed with the intention of eating. (However, if the intention is only to taste it for adjustments like adding spices, no blessing is required for this consumption). Hence, someone chewing a flavored chewing gum, even if ingesting very little, still must bless for the enjoyment of its taste. Similarly, when someone drinks something, they must bless it even if it's just a single drop of that beverage.

This all pertains to the first blessing, but the concluding blessing is only recited when one has a "significant consumption", which is the measure of a "kezayit" (about twenty-seven grams), and for drinking, the measure is a "revi'it", which is eighty-one grams.

Furthermore, the eating or drinking must take place within a time frame so that they are considered combined. For if a person eats within an entire day a measure of "kezayit" of bread, piece by piece, they certainly cannot recite the Birkat Ha'Mazon afterward. Rather, the consumption of a "kezayit" should be within the time known as "Achilat Pras". Halachic opinions vary on this time, some say five minutes, others say about seven and a half minutes (there are other opinions). Therefore, it's appropriate to always try to consume the measure of a "kezayit" (especially at Shabbat meals) within four and a half minutes to fulfill all opinions.

Regarding the concluding blessing for drinks, one should drink a "revi'it" (eighty-one grams) at once, for if they drink with breaks between sips, no concluding blessing is pronounced. Hence, someone who drinks soup with a spoon does not bless after drinking it, as they did not drink the measure of a "revi'it" at once. Likewise, someone sipping hot coffee or tea does not bless after, as they cannot drink it all at once.