Helianthus annus


While Jefferson took great interest in plants, such as sesame and olive trees, that produced useful oils, there is no indication that he recognized such a benefit in the Sunflower. His listing of it as one of the "Hardy perennial flowers" sown at Monticello in September 1771, seems to show that he grew it for its large and striking flower, a quality that keeps it in ornamental gardens today.

Growth Type: Annual Color(s): Yellow Hardiness Zones: 6 - 10 Location at Monticello: Vegetable Garden Planting Conditions: Full Sun Map it: 38.008851,-78.453687

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Blooming Dates 2001: Jul 12 – Aug 172002: Jul 19 – Aug 162003: Jul 17 – Aug 22003: Sep 13 – Sep 262009: Aug 25 – Oct 142010: Jun 28 – Sep 12013: Sep 3 – Oct 32014: Jul 2 – Sep 12