- "These are the Wrackspurt siphons — to remove all sources of distraction from the thinker's immediate area. Here, a billywig propeller, to induce an elevated frame of mind. Finally, the dirigible Plum, so as to enhance the ability to accept the extraordinary."
- —Xenophilius Lovegood explains the elements of his replica of Rowena Ravenclaw's Diadem.[src]
The Dirigible plum is an orange radish-like fruit. Dirigible plums grow upside-down on small bushes.
Some, like Xenophilius Lovegood, believe dirigible plums enhance the ability of one to accept the extraordinary. As such, on his stone bust of Rowena Ravenclaw, and in an attempt to recreate her lost diadem, he included this plant as part of the headdress. His daughter, Luna Lovegood, usually wore a pair of dirigible plums as earrings.
"Dirigible" means "able to be guided"; it is most commonly used in conjunction with airships, which have large motors to push them in the desired direction, instead of drifting before the wind as an unpowered balloon must. The word "dirigible" in the name of these plums could refer to their being shaped like airships, or to their guiding the thoughts of the wearer.
- Harry Potter and the Order of the Phoenix (First appearance)
- Harry Potter and the Order of the Phoenix (film)
- Harry Potter and the Half-Blood Prince (Mentioned only)
- Harry Potter and the Deathly Hallows (First identified as Dirigible plum)
- Harry Potter and the Deathly Hallows: Part 1
- LEGO Harry Potter: Years 5-7