When spring unlocks the flowers. Bishop B. Heber. [Spring.] First published in the Christian Observer, 1816, p. 27, in 4 stanzas of 8 lines, headed "Spring," and signed "R." In Heber's posthumous Hymns, &c, 1827, p. 98, it was repeated, after revision by himself, in 4 stanzas of 4 double lines, and appointed, without any apparent reason, for the 7th Sunday after Trinity. The text in common use is that of 1827.
--John Julian, Dictionary of Hymnology (1907)