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- From: rim@csadfa.cs.adfa.oz.au (Bob McKay)
- Subject: Re: List of cold climate gums
- Message-ID: <1992Nov18.232915.8173@sserve.cc.adfa.oz.au>
- Sender: news@sserve.cc.adfa.oz.au
- Organization: Australian Defence Force Academy, Canberra, Australia
- References: <1992Nov16.150346.90607@vaxc.cc.monash.edu.au> <fVnEMwN@quack.sac.ca.us>
- Date: Wed, 18 Nov 1992 23:29:15 GMT
- Lines: 48
-
- pharvey@quack.sac.ca.us (Paul Harvey) writes:
-
- >I've added temp data from Sunset Guide to Western Gardens and HortusIII.
- >As you can see, it don't get all that cold in Oz.
-
- I found these fascinating, partly because they're inconsistent in some
- significant cases with my own experiences. It may relate partly to the
- particular clones that are used in the US (you have some particularly
- beautiful forms of some of the dry country Eucs that I haven't seen here).
- I've annotated below the ones that seem problematical to me - any comments?
- (I've expressed my opinions fairly baldly below, but they should be read in
- the context of the above disclaimer about clones - I just don't want to have to
- keep repeating it)
-
- >>E. pauciflora Snow Gum 10-15oF
- This species is very variable, but there are certainly forms that can go
- colder than this.
- >>E. stellulata Black Sally 12-18oF
- This is one of the two most cold tolerant gums I know of. I don't have any
- temperature data handy (though I'll try to check it out tonight), but I find
- these limits hard to believe (and unlike the previous species, it's hard to
- explain it in terms of species variability, since it's not one of the more
- variable species)
-
- >Sunset also has the following "hardy" gums:
- >E. macrandra Long Flowered Marlock 8-12oF
- This seems optimistic, though I don't have actual data
- >E. niphophila Snow Gum 0-10oF
- This is believable.
- >E. rhodantha 8-12oF
- >E. sideroxylon Red Ironbark 10-15oF
- These are the most problematical for me. Around Canberra, sideroxylon appears
- to be temperature limited (as a wild species) and rhodantha is difficult even
- as a protected garden specimen. Contrast this with pauciflora and stellulata
- above, which grow quite happily in the wild, 3000 - 4000' higher and can't
- compete around Canberra (minima around 20F screen, 13F grass). The rhodantha
- value is particularly surprising - if there really are varieties of this
- superb small tree that can tolerate such low temps, they would be worth a
- small fortune in the local horticulture trade here (but I guess I could never
- get them through quarantine)
- Cheers
- Bob McKay
-
- --
- Bob McKay Phone: +61 6 268 8169 fax: +61 6 268 8581
- Dept. Computer Science Internet: rim@csadfa.cs.adfa.oz.au
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