Cult: Killing iris in the Cold


It sounds like what you all are saying is that the heaving is the 
thing that kills an iris that is planted too late in the Fall. That 
roots have not had a chance to grow, so as to hold the rhizome in the 
ground when the frost/thaw occurs.
Last year tried to plant a bargain basement BREAKERS in  November; it 
didn't heave...just rotted away (and died, of course). Are late 
planted rhizomes more suspicious to winter rot?  But then, I also 
rescued a few of a neighbor's rhizomes in Dec (he was moving away), 
replanted them, and they did just fine.
What I'd like to find out is: is it the heaving, winter rot, or just 
plain freezing a freshly planted vulnerable rhizome what would cause 
it to die??
If one is faced with this dilemma, and had to plant something in the 
late fall, what would give it the best chance of survival??
Thanks,
Laetitia


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