Kozo mishi ni iro mo kawarazu sakinikeri hana koso mono wa omowazarikere - Kinyo Wakashu(English Translation & Meaning)

去年見しに色も変はらず咲きにけり
花こそものは思はざりけれ

Roma-ji: Kozo mishi ni iro mo kawarazu sakinikeri hana koso mono wa omowazarikere
English Translation: Just as last year when
I saw them, with no change of hue
the flowers have bloomed—
it is the blossoms alone
that know nothing of sorrow
Meaning: Unchanged in color from when I saw them last year, the blossoms have opened; it is the flowers alone that know no sorrow.
Commentary: Book Nine Miscellaneous Poems I 524

The blossoms have opened without the slightest change of color from when she saw them last year; flowers, the poet sighs, know no sorrow. The poem suggests that a sad event has occurred between last year and this, and that while human hearts have changed, the flowers bloom as before. It contrasts a heart sunk in grief with blossoms that open knowing nothing.
Where the Kokin Wakashū poem asking the cherries of the Fukakusa fields, if they have hearts, to bloom in mourning gray this year alone sought a mourner's heart in the blossoms, this poem laments, almost enviously, the flowers' heartless constancy.

First line, 'kozo mishi ni', means though I saw them last year, the attributive shi of the past ki followed by ni.
Second line, 'iro mo kawarazu', means without a change of color.
Third line, 'sakinikeri', means they have bloomed, the perfective nu followed by the exclamatory keri; the poem breaks after the third line.
Fourth line, 'hana koso mono wa', means it is the flowers that, the particle koso answered by kere in the final line.
Final line, 'omowazarikere', means know no sorrow, the negative zu followed by kere, the realis of keri, answering koso in the fourth line.
Source: Kinyo Wakashu
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