I watched a rosebud very long
Brought on by dew and sun and shower,
Waiting to see the perfect flower:
Then, when I thought it should be strong,
It opened at the matin hour
And fell at evensong.

From “I watched a rosebud”
by Christina Rossetti

Yellow flowers bloom
But only during the day
At night, closed tightly

The color yellow is associated with joy, happiness, intellect, and energy. Bright, pure yellow is an attention getter. In heraldry, yellow indicates honor and loyalty. Later the meaning of yellow was connected with cowardice.

Yellow is an unstable and spontaneous color, so avoid using yellow if you want to suggest stability and safety.

The Rosebud
By William Broome (1689-1745)

Queen of fragrance, lovely Rose,
The beauties of thy leaves disclose!
–But thou, fair Nymph, thyself survey
In this sweet offspring of a day.
That miracle of face must fail,
Thy charms are sweet, but charms are frail:
Swift as the short-lived flower they fly,
At morn they bloom, at evening die:
Though Sickness yet a while forbears,
Yet Time destroys what Sickness spares:
Now Helen lives alone in fame,
And Cleopatra’s but a name:
Time must indent that heavenly brow,
And thou must be what they are now.