"It has little points. They’re leaves. Leaves from the wild."
Why do they get to keep their "leaves" and the other trees don't? "Because they are the protectors of the forest."
The "prickles" offer protection (put there by fairies), seeds make them grow, wizards take care of them, dragons eat their beans, and the snow doesn't go on them because it (the snow) knows they wouldn't like it.
Protection, growth, and magical creatures (good and bad) are recurring themes in our discussions. I'm thinking about those concepts a lot and how they relate to each other and to childhood.