Yes, that's correct. The segment aired on April 1st, which is April Fool's Day, and it was intended as a hoax. The narrator of the segment, Richard Dimbleby, explained that the mild winter and the "virtual disappearance of the spaghetti weevil" had led to a bumper spaghetti harvest. The footage showed Swiss farmers plucking strands of spaghetti from trees and laying them out to dry in the sun.

At the time, spaghetti was not yet a common food in the UK, and many viewers were not familiar with how it was made. As a result, the segment was quite successful in fooling many people into thinking that spaghetti really did grow on trees. It's a great example of how the media can shape people's perceptions and beliefs, even if those beliefs are not based in reality.
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