What is a trigger for opening a sequoia cone?

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fire
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Young sequoias are able to grow suc­cess­ful­ly only in mineral soils in full sun­light, free from com­pet­ing veg­e­ta­tion. They there­fore require periodic wildfire to clear the area. Due to very thick bark, the fire doesn't harm sequoia.

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Gender

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What is a trigger for opening a sequoia cone?
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