Growth, flowering, and survival of black-eyed susan from different regional seed sources
2001
Norcini, J.G. | Thetford, M. | Klock-Moore, K.A. | Bell, M.L. | Harbaugh, B.K. | Aldrich, J.H.
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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