RE: CULT: question - frost heave

Dana Brown <danabrown@peoplepc.com> wrote:
<< How much time between your first freeze and when the ground freezes
hard? >>

Dana,

 

In my part of northern Utah (Cache Valley), the first killing frost in Fall generally occurs between September 20 and October 10. This year, it was predicted to occur last Sunday night, but we dodged the bullet. The ground generally freezes hard around Thanksgiving (last 10 days of November). Typically, the really cold weather comes on quite abruptly - it can be relatively mild during the daytime in early November (but with frosty nights - big swings between day and night temperatures here because of the relatively high altitude and the (usually) clear skies).


-----Original Message-----
From: Jeffrey Walters 
Sent: Sep 28, 2005 9:41 AM
To: iris@hort.net
Subject: RE: [iris] CULT: question - frost heave

Susan Boyce wrote:
<< Linda,
here in Utah Our rule of thumb 
is get it into the ground 6 weeks before the first freeze. I try 
to get everything done by Labor Day at the extreme latest. I want to have 
those rhizomes get as many and as deep a root system in place before the 
ground freezes hard. >>



I follow the same practices as Susan; I would say that it represents the common wisdom about planting irises here in Utah. I have never experienced any particular problems with frost heaving. Once the ground freezes hard here, it generally stays frozen until the general spring thaw occurs in March (no alternate periods of freezing and thawing during the winter), so the rhizomes are literally frozen tight and can't heave.






Jeff Walters
in northern Utah
(USDA Zone 4)
Click here to donate to the Hurricane Katrina relief effort. 

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Dana Brown
AIS Region 17 RVP
Director ASI, TBIS
AIS, ASI, MIS, RIS, SPIS, TBIS
Malevil Iris Gardens
www.malevil-iris.com
Lubbock, TX
Zone 7 USDA, Zone 10 Sunset
danabrown@peoplepc.com



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Jeff Walters
in northern Utah
(USDA Zone 4)
 Click here to donate to the Hurricane Katrina relief effort. 

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