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:

The phrase "cutting - edge" is a compound adjective modifying "herb farm", and "vacuum - sealed" is a compound adjective modifying "room". No additional dashes are needed in the rest of the sentence.

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.