Abstract
ABSTRACT This research describes conditioning sequences for seven species of wildflower seed: smooth aster {Aster laevis). New England aster (A. novae-angliae), stiff white aster (A. ptarmacoides), swamp aster (A. puniceus), common boneset (Eupatorium perfoliatum), mountain mint {Pycanthemum virginicum), and tall prairie coneflower (Ratibida pinnata). The seed conditioning machine sequence that produced acceptable final products was brush-type thresher, round woven-wire screens, air column and indent cylinder. Operating parameters of these machines for the different species are given. The percentage of all seed saved based on the predicted initial quantity, varied from 58.1% to 92.2% and averaged 70.8%. The percentage of germinable seed saved for six of seven species averaged 74.7% with a range of 48.6% to 88.7%. For reasons not known, much greater quantities of E. perfoliatum germinable seed resulted after machine cleaning and threshing than from hand separation.
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