Fantasy Friday: The Slowest Assassin

As plots go, this one was so devious
No one could hold it in his head entire.
But what took Prince Trew far too soon from us
Began just with some seeds. Released by fire
As lore instructed, they were planted by
His royal hand when he was only four.
The tree grew as he did. At 35
He took the throne. Beneath the tree the score
Of gems were added to his crown. At last,
The final stone set in, a blossom burst
And dusted him with pollen. All too fast
He took his final breath. With that the first
Of his five sisters got the crown instead.
She gloated. 'Twas her gift that left him dead.