Halacha: What Blessing is Recited for Radish?

The blessing for radish is 'ha'adamah' (first blessing)

At the end of the meal, recite 'borei nefashot' (last blessing)

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Regarding the quantity of food required to warrant a last blessing (from "Daily Halacha" based on the teachings of Rabbi Ovadia Yosef zt"l):

For anything a person eats, they must recite a "first blessing" over it, such as the "shehakol" or "ha'etz" blessing. And even if one only intends to consume a small amount of the food, they are required to bless if they are eating it for consumption. (However, if a person only tastes the food to adjust seasoning or similar reasons, no blessing is recited at all). Thus, one who chews flavored gum, even though they swallow very little of it, must still bless for the enjoyment of the gum's flavor. Similarly, anyone drinking a beverage should recite a blessing, even if they only intend to drink a single drop.

This only applies to the first blessing, but a last blessing is only recited when a significant amount, referred to as "a significant eating," is consumed. A "significant eating" is defined as consuming an amount "k'zayit," or twenty-seven grams. For drinking, the amount required is "a revi'it," which is eighty-one grams.

Furthermore, the eating or drinking must occur within a time span that allows for combining the consumption. For instance, if one eats "k'zayit" bread over an entire day, piece by piece, they certainly cannot recite the Grace After Meals. The consumption of the "k'zayit" should occur within the time span known as "achilat pras." Authorities differ on how long this is, with opinions ranging from five minutes to about seven and a half minutes (with additional variations). Therefore, it is advisable to take care always to consume "k'zayit" within four and a half minutes, especially during Shabbat meals, to fulfill all opinions.

Regarding a last blessing over a beverage, a "revi'it" of the drink (eighty-one grams) must be consumed at once. If there is a pause between sips, a last blessing is not recited. Therefore, one who eats soup with a spoon does not recite a last blessing for drinking the soup, as they have not consumed a "revi'it" amount in one go. Similarly, when drinking hot coffee or tea, a last blessing is not recited because it cannot be drunk all at once.​