John Rock (American nurseryman) dating history

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John Rock (August 19, 1838 – August 9, 1904) was a German-born American horticulturalist and nurseryman. John Rock was a leader in California in pomology and the nursery business from 1865 until his death in 1904. Charles Howard Shinn wrote the entry for John Rock in L.H. Bailey's Cyclopedia of Horticulture He said "John Rock's scientific spirit, his wide and ever-increasing knowledge, his very high standards of business and his unselfishness made him during his long life the leader of Pacific coast nurserymen. He introduced more valuable plants and varieties to American horticulture than any other man of his period. His connection with Japan, India, Australia and with the great establishments abroad was close and constant. He did much to encourage men like Luther Burbank, and his collections were always at the service of students and the public."