Growth, Flowering, and Survival of Black-eyed Susan from Different Regional Seed Sources

in HortTechnology
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  • 1 University of Florida, Institute of Food and Agricultural Sciences, North Florida Research and Education Center, Route 4 Box 4092, Monticello, FL 32344.
  • 2 University of Florida, Institute of Food and Agricultural Sciences, West Florida Research and Education Center, 5988 Highway 90, Bldg. 4900, Box 3634, Milton, FL 32572.
  • 3 University of Florida, Institute of Food and Agricultural Sciences, Fort Lauderdale Research and Education Center, 3205 College Avenue, Fort Lauderdale, FL 33314.
  • 4 SePro Corporation, 11550 North Meridian Street, Suite 600, Carmel, IN 46032.
  • 5 University of Florida, Institute of Food and Agricultural Sciences, Gulf Coast Research and Education Center, 5007 60 Street East, Bradenton, FL 34203.

Growth, flowering, and survival of black-eyed susan (Rudbeckia hirta L.) from three seed sources—northern Florida (NFL), central Florida (CFL), and Texas (TEX)—were evaluated under low input conditions for one growing season at four sites in Florida. Two sites were in American Horticultural Society (AHS) Heat Zone 9 while the other two were in AHS Heat Zones 10 and 11. Growth, onset date of flowering, and number of flowers at peak flowering varied by site. With few exceptions, plants tended to reach peak flowering at about the same time. Flower diameter varied by seed source with TEX>NFL>CFL. While TEX plants were perceived as the showiest, NFL and CFL plants persisted longer under the low input conditions in Florida, and hence provided some evidence of adaptation to regional site conditions.

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