littlek wrote:[...] In Boston [...] there are some metasequoias there that are more than 100 years old [...]
You're wrong I'm affraid. Metasequoia is called a Dawn Redwood and it was discovered in the 40's of the 20th century in China. It simply cannot be that old in US.
If You say redwoods (native to US) I'll agree.
I have five metasequoias in my garden but they're rather young. Metasequoia is hardy in my zone but sequoias (Sequoia sp. and Sequoiadendron sp.) unfortunately are not hardy.
Greetings,
Bpjea