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Cold requirements for Pinus x Schwerinii 'Wiethorst' (3 Replies)

Posted December 2, 2013 at 6:01 pm

Would love to order the above Conifer of the Year (2014) but am concerned San Francisco, CA doesn’t get cold enough for it to thrive. Should I be concerned? Or is it fine to order? Thanks. JCC

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Posted December 3, 2013 at 12:42 am

Hey, a quick plant search for the Strybing Arboretum indicates they are growing Pinus strobus and Pinus wallichiana….the two species crossed to get schwerinii. A trip to the Strybing could reveal how they are thriving. And then there is the factor of provenance, what part of their native range do they represent. Anyways, I wasn’t surprised to see them listed as the Bay Area can generally grow fairly cold zone plants because of the cool marine air influence. I think it would be much more problematic to grow schwerinii where the days are consistently very hot and especially where the nights do not cool down. Other factors for the Bay Area can be wind and insufficient rainfall, but appropriate siting and irrigation can take care of that. Don’t know the chilling requirements for schwerinii, but I’m thinking it would have enough winter dormancy to perform adequately for the Bay Area. Dennis, CCOY Chair

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Posted December 3, 2013 at 12:55 pm

Dennis, thanks so much. I’m embarrassed to say I didn’t think to check the Strybing. John C.

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Posted December 3, 2013 at 7:04 pm

It does fine here if that is any encouragement (Petaluma). We’re Sunset zone 16 so a little cooler than you but not much. And there is a docent at Strybing named Mark Wales who is their conifer expert. He’s an ACS member so if you approached him I’m sure he’d be happy to chat about it.

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