Re: Comments on these perennials appreciated - Knautia
Marge --
That's true of a number of plants from the colder Zones. Sweet fern
(Comptonia peregrina) is another example. It grows rampant in the Upper
Penninsula of Michigan and transplants easily within that climate range
(Zone 4). However, when we bring it down here into Zone 6 in the
southern part of Michigan it simply melts in the hot, humid summers --
and I can't say as I blame it! ;-)
Dean Sliger
Warren, Michigan, USA
Zone 6B
Marge Talt wrote:
> Hmmm.....Bob, well UK doesn't count because it's not warm winters -
> ours aren't, really - it's the hot, humid nights of summer that I
> theorize kill off plants who are happy in zones 2 and 3 and sometimes
> 4. A couple of weeks of 95F doesn't count - we get that for the
> entire month of July and hotter - with no breaks - and continuing
> into August...just finished having a week of that lovely temp. here
> in May:-) Do your summer nights - as a general rule - cool down
> below 70 or 75F in summer?
>
> My theory is developing because I cannot keep plants like Cornus
> canadensis alive...they just melt away in a slow, agonizing (to
> watch, anyway) death. Seems to happen with any plant I try who is
> hardy to zone 2 or 3...hence this budding theory that I keep trying
> to test. Need people from MD, VA, NC, SC, and points south and west
> of that to testify here to help prove or disprove my theory...tho'
> certainly appreciate your input...and am thoroughly jealous of your
> plants.
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