Botany comprises all, but most people see it as a synonym of plant classification.

Horticulture is about growing plants and multiplying it, often with flower power overtones and moon myths that vastly underestimate its importance.

Veganism is often mistaken as a synonym of "botany loving people", but is just a religious movement started by a priest, and centered around the random ideas that:

1) Plants occupy a lower rank of importance among life beings because they lack a single particular type of sensor that only the cool animals have, and...

2) Plants are safe to eat, because they were designed by god for us

None of those ideas are validated by real facts. As people grows in the cozy comfort of their religious group they lose the capability to see the whole picture and turn into food zombies that move and hate just by inertia. You can show science here for weeks and weeks without finding a sign of intelligent life.

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Many people stop here and will never heard about:

Geobotany. Be afraid, very afraid. This is what a cabal of Da Vincy code linguists would do in the dark to bring pain to the world.

Most people will be put off by it in seconds, by the strange words and tedious lists, but there is an unexpected reward at the end when all pieces fall in place. You will never see the wildlife in the same way.

And plant physiology, that is like a really good sci-fi book.

Very complicated, defiant, dealing with really futuristic problems, and with more "hit the coin" moments that Mario. Who would imagine that the future of the humanity is linked with the capability to huge organisms to do physical work that makes the stronger animal look like crap