I am a bit stronger in the knowledge department (book-learning) than in hands on. Many people are more adept than me with growing vegetables. On the other hand, not that many actually know more about different kinds of plants.
I'm currently drooling (again) over a catalogue of weird fruits most people haven't heard of. I'm also particularly into things that flower in the winter (since any color is even more refreshing then) or have really interesting bark. I'm also into plants with fragrances.