|"Is this all real? Or has this been happening inside my head?"
The topic of this article is of a real-life subject that has been mentioned "in-universe" in a canon source. The Harry Potter Wiki is written from the perspective that all information presented in canon is true (e.g., Hogwarts really existed), and, as such, details contained in this article may differ from real world facts.
Larch (genus Larix) is a conifer in the genus Larix, in the family Pinaceae. Growing from 20 to 45 m tall, they are native to much of the cooler temperate northern hemisphere, on lowlands in the north and high on mountains further south.
Strong, durable and warm in colour, larch had long been valued as an attractive and powerful wand wood. Its reputation for instilling courage and confidence in the user had ensured that demand had always outstripped supply. This much sought-after wand was, however, hard to please in the matter of ideal owners, and trickier to handle than many imagined.
The celebrated wandmaker Garrick Ollivander found that larch always created wands of hidden talents and unexpected effects, which likewise described the master who deserved it. It was often the case that the witch or wizard who belonged to the larch wand might never realise the full extent of their considerable talents until paired with it, but that they would then make an exceptional match.