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- Newsgroups: rec.gardens
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- From: pharvey@quack.sac.ca.us (Paul Harvey)
- Subject: Re: Hardy Citrus was List of cold climate gums
- Message-ID: <fVGWzgI@quack.sac.ca.us>
- Organization: The Duck Pond public unix: +1 408 249 9630, log in as 'guest'.
- References: <1992Nov19.070101.25938@sserve.cc.adfa.oz.au>
- <fVyZc6b@quack.sac.ca.us> <1992Nov23.041926.11953@sserve.cc.adfa.oz.au>
- Date: 23 Nov 1992 22:27:26 UTC
- Lines: 50
-
- In article <1992Nov23.041926.11953@sserve.cc.adfa.oz.au>
- rim@csadfa.cs.adfa.oz.au (Bob McKay) writes:
- >The more we discuss this, the more puzzling it gets. I'm starting to think
- >the mercury in our thermometers here must be upside down! Assuming the
- >temperatures Paul quotes are air temperatures, rather than ground temps
- >(which can be significantly colder), the table mostly fits the Oz experience.
- >But there's one exception, lemons, which as I mentioned, are considered
- >relatively hardy here, despite minima down to around 21F most Winters, and
- >extremes down to around 16F. It may be partly varieties (Meyer, the one
- >mentioned, originated in Canberra), but other varieties, while not so hardy,
- >are still regarded as hardier than mandarins, grapefruit or oranges. Anybody
- >have an explanation??
-
- Well, who knows. They say that east is east and west is west and never
- shall they meant. Maybe it should be north and south instead. Anyway,
- Meyer is not a commercial variety but it is a common home variety
- because it is the most cold tolerant of the true lemons (C.limon). If
- Meyer originated in Canberra as you say, you might have a selection that
- is most hardy in Canberra but differs elsewhere, who knows why. Here is
- some more data from Sunset Guide to Western Gardens (ISBN:0-376-03889-6):
-
- Hardiness: Citrus of one kind or another are grown in every Arizona and
- California climate where winter temps do not fall much below 20oF. From
- least hardy to hardiest they rank generally in this order: Mexican or
- Key lime (28oF), limequat, grapefruit, regular lemon, tangelo and
- tangor, Bearr's lime, sweet orange, most mandarin oranges (tangerines),
- Rangpur lime and Meyer lemon, Owari Satsuma mandarin, sour orange,
- kumquat, calamondin (20oF).
-
- Improved Meyer: By law, this strain replaced the old-friend variety
- Meyer in 1978. It supposedly has more resistance to infection and virus
- diseases. Other than that, it should be like the original. Fruit is
- quite different from commercial lemon - rounder, thin skinned, more
- orange-colored. Tangy aroma, very juicy, but less acid than standard
- lemon. Bears fruit all year round, at early age. Tree is not a dwarf on
- its own roots. Will grow to 12ft with a 15ft spread. On dwarf rootstock
- it's half that size.
-
- ----
- Actually, Cali is a leader of citrus plants and buds in the world and
- someone discovered that we have a common virus here that doesn't affect
- the plants much in Cali, but may in other climates. Viruses are not at all
- cool amongst commercial growers and propagators, so Cali Improved Meyer
- is a virus-free selection of Cali Meyer and by law is the only one that
- can be commercially propagated in Cali. If Cali did not take this step
- to insure that all strains propagated are free of all viruses, they
- would have been banned from most if not all of the other commercial
- citrus areas. Viruses are as dangerous amongst plants as they are
- amongst humans. Yet another reason to follow plant importation laws when
- moving plant material from region to region.
-