"...trickier to handle than many imagine"
-- Mr. Ollivander
Larch is a tree which produces wand wood (Pm).
According to Mr. Ollivander, larch is a wand wood of "hidden talents and unexpected effects." Wizarding celebrity singer Celestina Warbeck's has a larch wand with a phoenix feather core, 10 1/2 inches, flexible (Pm)