Saw one outdoors up here recently. So far, so good, no damage after one winter outdoors. But in a sheltered spot very close to the coast, so it probably didn't get anything below about -4ð. Planted in fairly average clay-loam, most but not soggy. Growth rate hard to tell, as not yet established.

Resin

PS better treated as Cupressus vietnamensis

Hi Resin

What is the name of the place near you that has
the Xanthocyparis.I think however its more hardy
than people think.The are some X vietnamensis at
Bedgebury pinetum they came through -14C/6F with
no damage.

How quickly do they grow in their natural habitat on the large specimens I've only read about? What a mess if the whole Cupressus/Juniperus thing were to come into play if Xanthocyparis were to become scientific/botanic... nomenclature.

Thanks guys,

Dax

Supposedly it has survived outside in a sheltered spot in Moscow of all places. It grows well for me - mine is all adult foliage. I saw a plant in California that was all juvenile still and very distinct. I will share photos if my cuttings from it take...The largest I have seen are potted plants at RBGE where they are coning...

The ones at RBGE are grown from cuttings, they were already coning when the cuttings were taken. There appears to be a degree of persistence in foliage type, cuttings with juvenile foliage remain most/all juvenile for some time, cuttings from adult foliage ditto. Not sure if any seedlings have been grown anywhere yet.

Adult foliage plant (RBGE)

Juvenile foliage plant (RBGE)

Mature open cones (RBGE). Very similar to small Cupressus lusitanica cones.

Resin

My capillary action has increased upon reading about that one in Moscow. Thankss for sharing sal. Nice photos Resin... the adult foliage looks just as does Yellow Cypress, Cupressus nootkatenis and the cones are butifol!

Dax

Interesting... the juvenile foliage plant appearance is reminiscent of Cunninghamia.

.....but I suppose other juvenile plants are like that too ??

What does it all mean ?

Cupressus tonkinensis (also from Vietnam) juv foliage is somewhat similar, though its adult foliage and cones less so. I'd suspect the juvenile foliage morphology has much to do with adaptation to near-tropical rainforest conditions.

Resin

Here is a link that might be useful: Cupressus tonkinensis photos