I believe cold helps trigger growth in garlic, particularly hard necks, so some types may take more "chilling" time to get into gear. I think the other three garlic varieties you are growing that came up earlier are all Asiatic or Turban types, which are known to do well in warmer climates. The Siberian is a regular hard neck I believe and people often talk about how cold hardy hard neck types are. So the fact that it behaves differently and maybe needed more time in the cold soil to get growing seems reasonable to me.
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