Why some plants are “fooled” by a warm December and some aren't

With this year's unseasonably warm weather, there are odd things afoot in the garden. Some plants that would normally be dormant are coming back into growth. But perhaps odder is that while some plants have been “fooled” by the unseasonable heat, others are still resolutely dormant and not pushing any growth at all despite the warmth. Why is that?
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