I don't know specifically about this cultivar, but just across from the Arlington Hospital on North Edison Street there is a little house that has two trees planted in front. One is a giant sequoia and the other is a coast redwood. They have been there for something like 15 years and both are doing wonderfully. The coast redwood must be about 30 feet tall, the sequoia about 15 or so. There have been some cold winters since these trees were planted, so the coast redwood CAN show some winter hardiness as well as summer heat tolerance.

--Spruce

The Scott Arboretum is an exceptional collection of trees & shrubs on the campus of Swarthmore College. It is a big campus, I've never seen any Coastal Redwoods there.
My state maintains a Champion Tree List. The largest Sequoia sempervirens is 79' tall. This is on lower Eastern Shore, Wicomico County.
Perhaps someone can provide a link to Pennsylvania's Champion Tree List.
Sam

Here is a link that might be useful: Maryland's Big Tree champions

I've bought Sequoias from Empire Nursery and they are doing okay in the backyard, though I still think growing from seed is the better way to go in the long run. What they call "hybrids" are actually cultivars, so maybe their facts are a little off. I would be highly skeptical of Coast Redwoods doing well in z7. A well established tree might do rebound by sprouting after a cold winter, but it will be a struggle. Some of the cultivars listed are identical but have differing trade names.

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.

I've bought some from that place, so far they show no vertical growth. I have regular Coast Redwoods too and they are all growing vertical, I live in Southern Maryland, I will be curious to see if they will survive the winter.

""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.

Swarthmore College does indeed have an incredible collection of old/new trees alike (a ~7' dia American elm may be the biggest). Keep in mind that their redwood "success" is at least partially from excellent/knowledgable care & conditions there, perhaps better than most of us could reasonably provide.

Spruceman, I'd bet the coastal redwood you mention is well protected from winds & also benefits from urban warmth -- secret of success for it at that location.

this is interloper5 from a previous post, my Swarthmore redwood finally produced a leader since it was taken from a side branch originally, so it took 16 years but it only gets sun about 2-3 hours a day around noon to 2 pm .

Comments from my fellow PNW'er previously on this thread on lack of cold tolerance are not borne out by local reality. But then, he likes to take a rather negative outlook on plant hardiness in general :-) There are many long established and very large coast redwoods growing in this area that have experienced NO cold damage at all, even in our infrequent "extreme" winter events. In fact, the coast redwood is a Great Plants Pick, a PNW-focused data base of very garden worthy plants for any PNW garden!

Certainly cold hardy to zone 7 but limited by somewhat specific growing conditions to more coastal locations in the east.