Often a symbol of purity and secrecy, the white rose represents water and is the flower of moonlight. In parts of Scotland, a white rose blooming in autumn was thought to herald an early death, but a white rose bud symbolized a girl too young to love. In a lovely custom in Saxon times, red and white petals were showered on newly weds to represent their union of passion (red roses) and purity (white roses).
This is one of the medieval poems in an old collection I have, and it sums up that wonderful closeness a man and wife (hopefully) retain over long years together.
To His Wife
Love, let us live as we have lived, nor lose
The little names that were the first night’s grace,
And never come the day that sees us old,
I still your lad, and you my little lass.
Let me be older thank old Nestor’s years,
And you the Sibyl, if we heed it not.
What should we know, we two, of ripe old age?
We’ll have its richness, and the years forgot.