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- Newsgroups: rec.gardens
- Subject: "big tree"
- Message-ID: <1992Nov18.110910.131@janus.arc.ab.ca>
- From: thacker@RHEA.ARC.AB.CA
- Date: 18 Nov 92 11:09:08 MDT
- Reply-To: thacker@RHEA.ARC.AB.CA
- Organization: Alberta Research Council
- Nntp-Posting-Host: rhea.arc.ab.ca
- Lines: 49
-
- I live in Edmonton, Alberta. A couple of years ago while on vacation
- in California I bought seeds for the coast redwood (Sequoia sempervirens)
- and the "big tree" (Sequoia gigantea). Several of each germinated
- and are now growing well. What I want to know is whether the big
- tree would have any chance of surviving outdoors here, even to a
- bush size?
-
- While in one of the big tree groves I was suprised at how much snow
- there was (it was Feb. or Mar.), and remember the ranger saying that
- it had dropped to -20F earlier that winter. How cold does it get
- where big trees grow?
-
- The winter climate in Edmonton can be pretty tough on some trees for
- 2 reasons: extreme cold and wildly fluctuating temperatures that break
- winter dormancy and leave the tree succeptible to dessication or cold.
-
- With regard to cold, I have lived in the suburbs and outlying communities
- here for 6 years, and in two of those winters the lowest temperature did
- not reach -20F (thank you El Nino), but in two other winters it hit
- -40F on the coldest winter night. Maybe -30 to -35 would be the average
- coldest night.
-
- The fluctuating temperatures can be more of a problem for evergreens.
- Snow is usually on the ground here from mid-November to late March, but
- in some winters we get mild spells that melt all the snow in Jan. or
- Feb., causing the trees to break dormancy and transpire, but they can't
- get moisture from the frozen soil. Last year was very bad, with
- temperatures as warm as 60F in February, followed by sub-zero cold
- in March.
-
- Evergreens like jack pine, lodgepole pine, and white spruce are
- native to this area, while others like Colorado blue spruce, swiss
- stone pine, ponderosa pine, and bristlecone pine seem fully hardy.
- Eastern white pine only seems really vigorous in certain spots, and
- trees such as ginko, horse chestnut and sugar maple are not considered
- hardy, although there are some lovely 18 inch diameter sugar maples
- growing here (either in favoured microclimates or especially hardy
- individuals?).
-
- So what do you think? Should I just treat my big tree as an indoor
- specimen, or would it have any hope outdoors (with special protection
- or not). It's only a foot tall, with a foot spread now but it's
- quite a nice looking little big tree.
-
- (I should have added that the dessication problem is usually easily
- overcome by remembering to water sensitive evergreens heavily just
- before freeze-up).
-
- Comments?
-