The amount of misinformation on gardenweb boards over the years is very annoying to me. So many people talking out of their a--. It is a rare case that someone is authentically, forgivably mistaken. As pineresin is when he states no large S. semprevirens are found outside zn 8 & 9. "z8 is a tad marginal for Coast Redwoods" LMAO! In fact, there are two 90' coast redwoods in zn 7b Williamsburg, VA, and has been since around 1955 when they were planted. I personally saw that tree after 0F in 1994 and it was uninjured. Lightning, hurricanes, and inept college landscaping crews are the greatest threat to those trees now, if 1979 and 1985 could not kill them off. One was seriously damaged by Katrina. Furthermore, one of the best informed horticulturalists in the Washington, DC, area, discovered a large old CR tree in a 7a suburb of DC. He has a Pineresin level knowledge and there is absolutely no chance he was mistaken. I think he said it was around 40' but I could be mistaken. Such a tree would have survived well below 0F as recently as 1994. He tried to get Hines to micropropagate it as a hardy coast redwood but could not get them interested. (he is personal friends with higher-ups at Hines, and has introduced other plants through them) People don't seem to understand/appreciate that in the last several hundred thousand years the Earth's climate has experienced a great deal of variability and that most plants have resistance to conditions well beyond those in their current native ranges. Pictures have been posted of the test Wollemias in DC, after around 7-9F (sorry Pineresin you will have to translate) and some were almost uninjured appearing. That is probably 10F colder than the minimum in the current location where W.n. was found. I grew for many years a Fuchsia regia from the Orgon mountains of Brazil, a 9b roughly like the climate of J'burg, ZA, yet this plant tolerated 0F with ground frozen solid 6 inches deep. Such conditions would not have occurred in its native range for at least several thousand years, probably. Not all plants retained the genes that either purposefully or surreptitiously permit such survival of course.

""In 1990 there was foliage burning here in Zone Z8. Out on the coast the wild redwood groves die out and are replaced by Sitka spruce way down in extreme southwest Oregon, where the ecosystem is basically an extension of a Calfornia one across the state line. The spruce takes over because the non-Californian climate is too cold for the redwood."" Hi bboy. Coastal Southern OR too cold? Perhaps the Redwood would be the climax species? Sitka spruce would more weed-like companion to first start? Around the Mt St Helens blast zone there are very few Douglas firs, Grand firs, Noble firs, Ponderosa Pine, or Western Hemlock. What you do find is Poplars/Cotton woods, Red Alder and even Big Leaf Maples. Does that mean the more climax like conifers won't return? No.

Terminal cuttings are best taken in March. 8000 ppm IBA hormone mist and bottom heat.Results are variable. Al

You didn't say if you've been growing them indoors or outside. I like to take advantage of the summer months and leave my seedlings outside all summer in partial sun/shade so they build roots and photosynthesize, all the way into late Fall when cool nights and diminished sun exposure causes the seedlings to go dormant. Next, place them somewhere that stays cool enough so the stay dormant (35f-45f degrees). You want to be able to check on them so they don't dry out and secure enough so varmints can't prune them off for you. I've never grown in zone 6 so I assume it's a lot easier than zone 3 where I live.