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Chamaecyparis lawsoniana – new rootstock for cultivars (1 Replies)

Posted February 17, 2017 at 4:49 pm

The Winter 2017 Quarterly (p 6) refers to the “drought-resistant” rootstock for ‘Blue Surprise’. I’m assuming this is the one being widely used for grafting Lawson Cypress cultivars so the plant will not be as difficult to site and allows it perform better, if not thrive then in the past.

My understanding is that a group of Lawsons was found in an area with wetter soils than one could expect Lawsons to grow well. Wasn’t it someone from Oregon State that found this group? And I also think that the rootstock being referred to is the 5th generation of seedlings – all of which were planted in the same or a similar location as the original plants. As I understand the story, the best of the survivors were the ones used as a seed source and replanted – 5 times. Therefore, this rootstock would allow for more soil moisture than normal, as opposed to the plants being more drought resistant.

I’ve also seen it referred to as being “disease” resistant.

Can someone clarify what this rootstock is and does? Is my understanding somewhat accurate and to what degree?
Thank you! Phin Tuthill

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Posted February 19, 2017 at 11:22 am

Hi Phin,

you are quoting an unfortunate typo in the CQ. “DR” does indeed stand for Disease Resistant, not Drought Resistant. All members of this species are fairly drought resistance having evolved along the western U.S. coast which experiences a yearly seasonal drought that usually lasts from June though October every year.

Here is a link to a pretty good article that discusses DR Lawson cypress. the link . . .

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