She shares the same voice actresses as Giggles and Cub.
She and Splendid are the only main characters not to feature on the Complete Disaster DVD box cover (left).
The only main character she has not yet interacted with is Russell.
In season 3, her alliterate sentence is: Plant plenty of pretty, perfumed, purple and pink flowers!
As of Royal Flush, her OCD has returned from the TV series, though she didn't freak out in Breaking Wind from Splendid's gas.
She is always wearing an air freshener around her neck, takes five showers a day, and she is always trying to keep herself and her surroundings as clean as possible. These facts may hint that she suffers from Mysophobia, or a fear of germs/contamination.
Despite being a neat freak, in her TV title card, the flowers around Petunia start to die. It's possible that she might have used her skunk spray.
People often mistake her for a "squirrel" because of her tail size.
The marking on Petunia's head is extremely similar to the marking on Aang's forehead from the Nickelodeon cartoon Avatar: The Last Airbender. Coincidentally, the markings on both characters are light blue.
Although the marking on Petunia's back is a triangle most of the time, in earlier episodes, it occasionally changes to a line or disappears completely.
Even though Petunia doesn't have hair in the show, she was seen with a very long French braid of blonde hair in Dunce Upon a Time.
Petunia's tail has shrunk significantly during the newer episodes.
She has survived 15 out of the 65 episodes she has appeared in. If she survived her debatable deaths she would have survived in 20 episodes.
The only TV episodes she does not appear in are "Twelfth Night".
She appears in all three TV episodes of "Seventh Heaven".
In every episode that features Petunia's obsessive compulsive disorder, said disorder causes her death:
Wishy Washy: She tries to clean herself by peeling her skin with a potato peeler.
Wingin' It: When she tries to wash her hands, the suction of the drain squeezes out her organs.
Home Is Where the Hurt Is: Lumpy sees Petunia through a grate on a floor above her and gets crushed by a fold-in bed. Parts of Lumpy's body falls on her, covering her in blood and chunks of flesh. When she tries to shower, she gets electrocuted because Lumpy unknowingly mixed water pipes with electrical pipes earlier in the episode.
Royal Flush: She screams in horror because she sees a little olive on the floor. She accidentally sucks up Mr. Pickels with her vacuum cleaner, causing it plug. She then puts the nozzle to her eye, causing her brain to get sucked out. When Lammy tries to help her, she explodes when Lammy puts the vacuum on blow.
She was the first character to die a bloodless death. This occurred in Stayin' Alive.
She and Cro-Marmot are the only characters who are not members of a duo never to star without co-starring with anyone in a regular episode.
She and Handy were the last characters to debut in 1999.
She and Russell are the only Happy Tree Friends with actual human names.
Petunia is one of the few characters to eat/drink the remains of themselves or another character, the others are Cuddles (thrice), Giggles (four times, one time offscreen), Toothy, Lumpy (twice, one time offscreen), Nutty (twice, one time offscreen), Pop (Offscreen), Cub, Flaky (twice, one time offscreen),The Mole (Offscreen), Russell (Offscreen), and both sides of Flippy (thrice)..
Petunia was the first character to eat the remains of another character. She ate Shifty (as a hot dog) in Meat Me for Lunch, but didn't realize it until after she felt his eyeball.