Re: CULT: TB winter hardy?

--- In iris-talk@y..., "Janet Stromborg" <twinhill@e...> wrote:

>>>>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. <<<<<

I don't live in a Zone with a January thaw or lack of a snow cover. 
However, I _did_ mulch TBs with pine needles (as RosalieAnne did) one 
winter with no problem. I know now they were unnecessary and I found 
myself on my soggy knees trying to pull the half-frozen needles off 
the rhizomes in April - there was still snow in various parts of the 
garden. The ground is unworkable here until May. 

Chris Hollinshead in the Toronto, CA area mentioned putting rocks on 
rhizomes more than once on this list or its predecessor list, iris-l.

The danger zone for freeze-thaw seems to be USDA Zones 4-7. TBs seem 
to be the prime target presumably due to size of rhizomes.

Ellen Gallagher/ NH/


 

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