I live in Vancouver Canada was wondering when they start to flower. Have 2 plants south facing

A customer has a question and I hope we can get some opinions on it, thanks

I live in Vancouver Canada was wondering when they start to flower. Have 2 plants south facing.

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The shorter hours of waning summer will trigger flowering.

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We force inside plants to flower with 12/12 light. That happens in Vancouver on September 25th. Most strains will actually start to flower a few weeks before that.