What is the life cycle of flowers as presented in the poem "A Contemplation Upon Flowers"?

In this poem, the narrator is admiring the life cycles of the flowers.

You come abroad, and make a harmless show,
And to your beds of earth again

He notes how the flowers grow and blossom, then humbly return to where they came from for the duration of the seasons that are not spring. The flowers are described as not fearing death, as they experience it every year. "O that I could my bed of earth but view / And smile, and look as cheerfully as you!" The flowers apparently smile and look cheerfully at death, knowing that they will return the next year. The human narrator wishes he did not fear death, since he prefers to live in a "constant spring."

The life cycle of the flowers is presented and focused on to emphasize the way that humans fear death. Flowers greet it and do not fear it, and the poem suggests that we look at our own lives the same way.

O teach me to see Death and not to fear,
But rather to take truce!

The narrator says this to begin his last stanza. He wants to learn from the flowers, and to make a "truce" with the concept that makes so many feel fear.

Hope this helps!