Abstract
ABSTRACT The yield and content of active compounds in Echinacea purpurea Moench. were studied to define the best harvest time. Plant roots, stems, leaves blades, petioles, flower buds, flowers, and green fruit were collected from one- and two-year-old plants during the rosette, flowering stem formation, flower initiation, full flowering, and green fruit stages of growth. Yields were highest for the one-year-old plants harvested at flower initiation and for the two-year-old plants harvested full flowering. In both years, leaf blades contained the most active constituents of all the sampled tissues, although flower buds also contained relatively large concentrations.
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