Carl Linnaeus a rare book, if he let Linnaeus stay with him, and Burman accepted. On 24 September 1735, Linnaeus moved to Hartekamp to become personal physician to Clifford, and curator of Clifford's herbarium. He was paid 1,000 florins a year, with free board and lodging. Though the agreement was only for a winter of that year, Linnaeus practically stayed there until 1738. It was here that he wrote a book "Hortus Cliffortianus", in the preface of which he described his experience as "the happiest time of my life." (A portion of Hartekamp was declared as public garden in April 1956 by
Linnaeus' flower clock Linnaeus' flower clock Linnaeus' flower clock was a garden plan hypothesized by Carl Linnaeus that would take advantage of several plants that open or close their flowers at particular times of the day to accurately indicate the time. According to Linnaeus’s autobiographical notes, he discovered and developed the floral clock in 1748. It builds on the fact that there are species of plants that open or close their flowers at set times of day. He proposed the concept in his 1751 publication "Philosophia Botanica", calling it the "Horologium Florae" (lit. ""flower clock""). His observations of how plants changed over time