it is just customary to pitch your dry yeast on top of your wort. if the yeast is directly pitchable, it doesn't matter where you put it, it will mix into the wort as long as it doesn't clump. if you rehydrate your yeast first, or are using a wyeast or some other liquid pitchable yeast, its simple diffusion once you pour it in so just put it in any time.
the only thing i would be concerned with is temperature. depending on what i am making the wort or must may sometimes be warmer than the yeast might like on transferring to the fermenter so if you pitch the yeast in the dry bucket/carboy, and the wort is too hot, you might hurt your yeasty friends.
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Planned: Mango Wine (~15%) - 2/19/12
Planned: Grapefruit Wine (~15%) - 2/19/12
Planned: Vino Italiano Merlot Kit (~15%) - 2/19/12 don't judge me!
Primary: Apple Cider (~18.6%): started 2/6/12
Secondary: Pineapple Apertif (~18.5%): racked 2/6/12
Secondary: Cookie Dough Porter (~9.5%): racked 2/7/12
Tertiary: Diaginjo Sake (~20%): racked 2/7/12
Bottled: Hard Tea (9.5%) 11/20/11
Bottled: Lemonale (11.5%) 12/17/11
Bottled: Chocoberry Stout (Chocoloate and Cranberry) (11.1%) 1/21/12
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