"There's more than one?" he asked, faking bewilderness for a moment before he grinned. "The first one - these are fairly tame," he said, jostling the plants he was still holding a bit to indicate what he was talking about. "They don't need to be put until guard in three or anything," he chuckled a bit.
He nearly asked if she remembered the way, but he knew that he wouldn't forget the way even if he left Hogwarts for an extended period of time, so he didn't bother. He imagined that if she did happen to briefly forget, she'd just follow him anyway.
"Thanks for the help," he added as he started to head out to the green house. "It's much easier to carry this stuff when I can see where I'm going," he smiled.