Is meaning to be found only in the context of aggression and domination --
raw physical or political power ?
Could the significance be in Mastering ... of fear and loathing. I offer this reflection in the following passage from Nietzsche's notebooks:
"I have found strength where one does not look for it: in simple, mild, and pleasant people, without the least desire to rule—and, conversely, the desire to rule has often appeared to me a sign of inward weakness: they fear their own slave soul and shroud it in a royal cloak (in the end, they still become the slaves of their followers, their fame, etc.) The powerful natures dominate, it is a necessity, they need not lift one finger. Even if, during their lifetime, they bury themselves in a garden house!"
I'll go with John Robb's broader optomistic meaning.
We must cultivate our gardens.