Suberagi no sue sakayu beki shirushi ni wa kodakaku zo naru Wakamatsu no mori - Senzai Wakashu(English Translation & Meaning)

皇の末栄ゆべきしるしには
木高くぞなる若松の森

Roma-ji: Suberagi no sue sakayu beki shirushi ni wa kodakaku zo naru Wakamatsu no mori
English Translation: As a sign that our
sovereign's line shall flourish on
to the end of time,
how tall the trees are growing
in the Wakamatsu wood
Meaning: As a sign that the sovereign's line will flourish far into the future, how tall the trees are growing in the Wakamatsu wood, the wood of young pines.
Commentary: Book Ten Poems of Celebration 636

Headnote: "Composed on the Wakamatsu Wood in Ōmi Province as a provincial song for the Yuki side at the Great Thanksgiving Festival of the second year of Kyūju, in the reign of the Retired Emperor"
Composed on the Wakamatsu Wood in Ōmi as a provincial song for the Yuki side at the Great Thanksgiving Festival of 1155, in the reign of Emperor Go-Shirakawa. As a sign that the sovereign's line will flourish, he says, how tall the trees are growing in the Wakamatsu Wood. In the young pines growing taller year by year he sees a sign that the new emperor's reign will flourish long, and so celebrates it. "The Retired Emperor" in the headnote is Go-Shirakawa, who commanded the compilation of this anthology. The first line in the text reads "suberagi," which does not match "sumeragi" in the line of kana readings; the text is followed here.
The author, "Nagenori, Minister of the Imperial Household," is Fujiwara no Nagenori. A Confucian scholar of the Southern House of the Fujiwara, he served as Professor of Letters and rose to Minister of the Imperial Household, and he was repeatedly called on to compose poems for the Great Thanksgiving Festival.
The final poem of the book, 640, calls the cedar grove of Mount Mikami a "sign," so that this poem's Wakamatsu Wood and that grove both make a stand of trees the sign of the reign.

First line, "suberagi no": "suberagi" means the emperor.
Second line, "sue sakayu beki": "sue" means descendants or the future, and "beki" is the attributive of the conjectural "beshi," "which is to flourish long."
Third line, "shirushi ni wa": "as a sign." Poems 619, 627 and 640 of this book also speak of a "shirushi."
Fourth line, "kodakaku zo naru": "kodakaku" means trees growing tall, and the emphatic "zo" closes with the attributive "naru."
Fifth line, "Wakamatsu no mori": a place name in Ōmi, weaving in a place name of the Yuki province. The name "Wakamatsu," "young pine," suggests a reign growing ever more vigorous. It ends on a noun.
Author: Fujiwara no Naganori
Source: Senzai Wakashu
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