CULT: TB winter hardy?


  ----- Original Message ----- 

  To: iris-talk@yahoogroups.com 
  Sent: Sunday, July 22, 2001 9:08 PM
  Subject: [iris-talk] TB: winter hardy ? was OT: bio. etc.


  --- In iris-talk@y..., "Jeff and Carolyn Walters" wrote 

  >I do not know of any TB irises than cannot stand the lowest 
  temperaturesthat are likely to occur in Zone 5 (and it has gotten down 
  to 30 below zero F here and stayed there for several days at a 
  stretch). However, if youlive in an area where repeated freezing and 
  thawing occurs during the winter, that might have a fatal effect on 
  some irises rather than low temperatures per se.<

  Hi list mates,

  I live in one of those areas where we have a traditional January thaw (Northeast Wisconsin, zone 4)and sometimes find my TB iris rhizomes heaved up out of the ground in the spring. This is usually a problem only in newly planted beds if my most recent acquisitions don't arrive until fall and don't have a chance to establish a good root system before winter sets in. I'd like some opinions on whether you folks think it's better to mulch these new beds in fall and take a chance on rotting the rhizomes, or take a chance on them surfacing and freezing.  Hmmmmm....the frying pan....or the fire....

  Janet in Denmark,  WI  USDA zone 4




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