The Sierra version should be fine, the coastal species not so good, they can't take cold. Soil should drain well, give the trees a lot of room, I think they like acid soil. I am out of seeds for both, I sent the last Sempervirens to France, Giganteums went to Austria, both are doing well.
There were some Semps growing in Everett Wa, We had a cold snap, dropped to +5, all the foliage died and most of the limbs. The trees did come back, but as bushy spars. As you know, their natural range is very temperate. The Sierra Redwoods live and thrive in a much harsher envirorment.
Have you seen the "white" Redwoods? There are some in the Humboldt Redwoods Park, near Weott.
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