つぼみがほころび始めた。

つぼみがほころび始めた。

The buds began to open.

つぼみがほころび始(はじ)めた。

Tsubomi ga hokorobihajimeta.

蕾 (つぼみ)

bud; flower bud

が (が)

indicates sentence subject (occasionally object); indicates possessive (esp. in literary expressions); but; however; still; and

綻びる (ほころびる)

to come apart at the seams; to be ripped; to be torn; to begin to open; to begin to bloom; to smile broadly; to break into a smile

Readings: シ、はじ.める、 -はじ.める、はじ.まる

Meanings: commence, begin