Dāngnián zhòngxià de xiǎo shùmiáo, rújīn yǐ wèirán chéng lín.
The saplings planted back then have now grown into a lush forest.
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usage
Written, for thick, lush plant growth, as in 欧阳修's 望之蔚然而深秀 'looking lush, deep and lovely'. The figurative 'flourishing' lives mainly in 蔚然成风 'to become a general trend'. 蔚 is wèi here, not the surname Yù.