Originally written on 22 April 2007 for [livejournal.com profile] polkadotsquared in [livejournal.com profile] mctabby's Cat's Birthday HP Drabblethon IV, based on the prompt A giant mandrake takes over the trio's 7th year herbology lesson.

***

Harry had never seen Professor Sprout move so fast. The bottle of Porphyria Pennyroyal's Premiere Plant-Gro Potion barely had time to shatter before she had her wand out, casting a Silencing Charm so strong that Harry's ears popped with the force of it.

'Out!' He couldn't hear Sprout's voice, not with the charm in place, but there was no doubt as to what she was saying as she pointed to the greenhouse door. 'Out NOW!'

Hermione was already grabbing his jumper and pulling him towards the door. There was real fear in her eyes. Harry tried to resist, to turn round to help Professor Sprout, but the moment he looked over his shoulder and caught sight of what Hermione was looking at, all thoughts of staying behind and being a hero vanished from his mind.

If a baby mandrake's cry could knock someone out, and a grown mandrake's cry was instantly fatal, Harry didn't want to sit around and contemplate what would happen if anyone heard the noise made by a half-grown mandrake that had swelled to three times its normal size and seemed to be getting bigger by the second.

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