Can you think of any hobbies that are directly related to gardening?

One thing my garden does for me is provide memorial space.  

My little dog died after a long life that bridged the life shared with resident children to kids graduating from college. I buried her in the garden.  I knew I would be moving within a couple years.  I planted brilliant oriental poppies next to her.  

Ever since, each time I expect to be in the same place for years, I plant brilliant red oriental poppies to remind me of her and all we shared.

The young son (30 ish) of a friend of mine died under curious circumstances.  He had been in Mt Shasta, Ca. moved on to Ashland, Oregon where he died.  I plant Shasta daisies for him.

I had a big wonderful Komondor who lived a long good life with me.  I was staying at a mountain cabin originally built in 1929 as a homestead.  I composted her, and when her bin was done, I brought the compost to my home in the valley below.

We can include so many things in our garden spaces.  Including but not limited to everything from art to junk.

There, we can find a place for our dreams, and time for contemplation.

Nancy Reading wrote:Does posting on permies count as a hobby ;) ?

It better - I spend way too much time doing so, and I don't want to call it work!

Eating was the first thing that came to my mind. You might not think of it as a hobby, but I spend a lot more time on it than required for simple nourishment, so I guess it qualifies.