Question

insert dashes where needed.
at sunfest organic farm—a cutting-edge herb farm in okeechobee, florida the herbs are washed with ultraviolet light in a vacuum-sealed room.

Explanation:

To properly punctuate the sentence, we need to add a dash after "Florida" to set off the main clause from the preceding descriptive phrase. The phrase "At Sunfest Organic Farm—a cutting - edge herb farm in Okeechobee, Florida" is a descriptive part, and then we need to separate it from the main clause "the herbs are washed with ultraviolet light in a vacuum - sealed room" with a dash for clarity. So we insert a dash after "Florida".

Answer:

At Sunfest Organic Farm—a cutting - edge herb farm in Okeechobee, Florida—the herbs are washed with ultraviolet light in a vacuum - sealed room.