Having suffered from the problem of using tikz to draw a tree, and finding child nodes overlapping, I discovered a solution (unsurprisingly) on this StackExchange forum page - to use the tikz-tree package.
Only problem, even with my sibling distance on level 2 (root level is offset 0) set to 7mm, nodes b and c were closer together than I wanted:
I've heard in the past that the idea that bananas are herbs was some horrible myth spread specifically by the Internet. Not true - I remember hearing it as a child, just like the idea that only an insane person could draw a perfect circle.
"Great," I thought, "now I can check this out properly," and went to google it. Almost nothing but the band, various "how to" pages, and something on a Terry Pratchett wiki, which came closest to providing a hint regarding the origin of the idea. I'll add this to my list of things to check in ten years' time (if both I and the Internet are still around), as sometimes these things take a while to get included (like Peterkin Custard).
In the meantime, here's a video of a seemingly sane man drawing one.
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