The adverb phrase in the sentence "Citrus fruits are grown in California and Florida" is "in California and Florida."
Here's why:
1. Adverb phrases modify verbs, adjectives, or other adverbs. In this sentence, the verb being modified is "are grown."
2. The adverb phrase "in California and Florida" tells us where the citrus fruits are grown, providing additional information about the verb "are grown."
3. Adverb phrases often answer questions like how, when, where, why, or to what extent. In this case, the adverb phrase answers the question "Where are the citrus fruits grown?"
Therefore, "in California and Florida" is the adverb phrase in the given sentence.