Sad Cypress is a wonderful Poirot book by Agatha Christie.

It begins with the quote :

 “Come away, come away, death, And in sad cypress let me be laid.”

From whence cometh this quote? And why “sad” cypress?

Well. Sad because : Cypress Wood used to be used to make coffins.

And………..Check out 12th Night by Monsieur Shakespeare?

Come away, come away, death,
    And in sad cypress let me be laid.
Fly away, fly away, breath;
    I am slain by a fair cruel maid.
My shroud of white, stuck all with yew,
             O, prepare it!
My part of death, no one so true
         Did share it.

Not a flower, not a flower sweet,
    On my black coffin let there be strown.
Not a friend, not a friend greet
    My poor corpse, where my bones shall be thrown.
A thousand thousand sighs to save,
             Lay me, O, where
Sad true lover never find my grave,
             To weep there!

End Note :

Hecate was said to favor offerings of garlic, which was closely associated with her cult.^[47] She is also sometimes associated with cypress, a tree symbolic of death and the underworld, and hence sacred to a number of chthonic deities.^[48]

Well. I might’ve covered Agatha, Poirot, Hecate, Life, Witches, Roses, Dracula, Death, Shakespeare, Mythology and a bit more there (?)