Analysis of information sources in references of the Wikipedia article "Rose hip" in English language version.
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According to the winter environment in the rose's native regions, a specific, adapted seed dormancy was established. In species like R. rugosa, R. gallica, R. canina, and *R. soulieana, it is known that dormancy can only be broken following intervals of chilling at 1–4 °C. Before germination, some roses require a second winter vernalization.