I suppose you'd have to know a bit about the aliens, and about their plants. But humans in the future ought to know at least a little about humans and about trees :-).
Depends on how long we have trees and if we stop to look up from our phones (my point being that we can't make too many assumptions).
If we're talking about a 10,000 year span then yes. But if we're moving to a 100,000 year span, I wonder if we should also be asking ourselves if humans will still be the dominant species...