he spent a lot of time observing flora and fauna and weather [...] pursuits like that can bring you back to Earth from the ether and the abstractions. They could be imagined as the opposite of writing. Writing is a murky business: you are never entirely sure what you are doing or when it will be finished and whether you got it right and how it will be received months or years or decades after you finish. What it does, if it does anything, is a largely imperceptible business that takes place in the minds of people you will mostly never see and never hear from (unless they want to argue with you). As a writer, you withdraw and disconnect yourself from the world in order to connect to it in the far-reaching way that is other people elsewhere reading the words that came together in this contemplative state. What is vivid in the writing is not in how it hits the senses but what it does in the imagination.
A garden offers the opposite of the disembodied uncertainties of writing. It's vivid to all the senses, it's a space of bodily labor, of getting dirty in the best and most literal way, an opportunity to see the immediate and unarguable effect.