The barren ground that blossoms is the right hemisphere of the mind coming into bloom through meditation, the still garden of the being brought into full flower. This renewal is creative life happening now, in the living person, not a reward held back for some distant afterlife.
The glory of Lebanon is the whiteness that comes with that awakening, and Sharon is the level plain of the lower mind made ready and even. To see the glory of God is to watch the desert side of the self grow fruitful here, in this life, and to return here again rather than to a far-off heaven, the mind flowering as the medicine of stillness does its work.
Lebanon: the whiteness that shines when the higher mind awakens
Sharon: the level plain of the lower mind, smoothed and made ready
The garden: the right hemisphere of the brain that blossoms under meditation