Assertion: jerusalem artichoke's seed | /r/HasProperty | le cochec
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Source sentences:
text: For 'Violet de Rennes,' for example, flowering date varied from June 20 to September 5 to September 30 for plants growing in Tenerife (28°N), Valencia (39°N), and Rennes (48°N), respectively, with the plants in Rennes failing to produce seed (Le Cochec, 1988).