It's probably promising that they figure they can approach him like that. Progress with this sort of thing is always slow and staggering, but all things considered - they're doing a pretty good job of it. Tim's expression even resolves into the closest thing he gets to a smile on a regular basis.

"Trying to learn how to garden, mostly." It's plain from the wryness in his tone that trying is the operative word there. "I figure we should start growing our own shi - " He backpedals impressively, all things considered. " - food before we run out."