Severus nodded with a shrug to her thanks, which had the effect of making him tilt his head to one side more than anything. She made it sound as if he were doing her some tremendous favor, but it was no imposition to scribble things down in his book once and then his journal a second time, as well. Though viewed from her perspective, it likely was a very great favor. "It's no trouble," he assured her, shaking his head.
He nodded again when she confirmed the page number for him, though he frowned at her conjecture. "No," he muttered, almost sorry to have to disappoint her. She really did have a hard time with this stuff, didn't she? "Much more mundane that that, I'm afraid. Remember what Professor Sprout said--"
He broke off trying to remember when, exactly she'd said it, but he was drawing a blank. To get up to speed over the summer, he had re-read all his notes from previous years, all of which he had kept because he was simply that meticulous. After a while, however, they had started to blend together, in spite of his having put a date to each new lesson's notes. He could have sworn that lesson had been in April of fourth year, but he wasn't sure, so he had to be a bit more vague.
"--a while back about dragon dung being so caustic? A full ten on the Pritchard Scale? Belladonna can only tolerate fertilizers up to a seven. You'd think, being such a deadly poison, that it might be a little more hardy, but unfortunately, it isn't. The plant itself is relatively delicate, and far as plants that can kill you go. It's certainly no Devil's Snare or Venomous Tentacula."