Keith Urban may not have a green thumb, but he understands the concept that gardening is all about maintaining -- and he strives to look at his family and marriage in the same way. 

Urban has a beautiful wife in A-list actress Nicole Kidman, plus two daughters -- Sunday, 5, and Faith, 2, but he doesn't take his family for granted now that he has them. Instead, the singer works at maintaining those relationships every single day.

"Nic and I say, 'Balance is never achieved; it's just maintained,'" the 'Little Bit of Everything' hitmaker shares in People's December country issue. "I'm a guy, so I'm not used to having to maintain anything. I'm used to achieving something, and good, that's done, move on to the next thing."

He continues, "No, no, this marriage, this family, it's a garden. It's not fixed and then you move on; it's maintained on a daily basis. I finally get that now."

The 46-year-old relishes soaking in the moment, knowing life moves by so very quickly. "Somewhere in the last couple of years, I've really grasped the concept of the brevity of time," he reflects. "It's very, very fleeting. No matter how many years are ahead of us, it will all be gone very quickly. I don't want to miss any of it."

With his tenacious efforts in maintaining his family, combined with his admiration of Kidman (who calls Urban her great love), there's no question that the Urban-Kidman household will flourish, as long as they keep giving it some TLC.