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thistle normally initiates flower

Listing 1 - 2 from 2 for thistle normally initiates flower

Control Practices for Biennial Thistles in Perennial Grass Crops, Botany & Plant Pathology, Purdue U.
... thistle also kill pasture legumes. Spot spraying individual plants or patches rather than broadcast spraying the entire pasture also spares the legumes. Musk thistle normally initiates flower stalks in early May and reaches full flower ... by late fall. Musk thistle is extremely aggressive. Bull thistle normally initiates flower shoots in July and reaches full flower in August. Seed production ...

Control Practices for Canada Thistle, Botany & Plant Pathology, Purdue U.
... OF CANADA THISTLE Canada thistle is a cool season perennial which spreads by seed and vegetatively by creeping roots. In Indiana, Canada thistle normally initiates growth in spring, reaches the flower-bud stage the first week in June, and full flower about the third week of June. ...
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