Parallel regions
Fri, 20 Nov 2009 10:59:33 PST
On 20 Nov 2009, at 10:12, J.E. Shields wrote:

> How about approaching this from the point of view of what species are hardy in a
> given location, e.g., central Indiana in my case?

It strikes me that a deeper, and possibly more interesting, question is the 
identification of hardiness indicator plants. A good start on this issue would 
involve those interested listing plants that don't quite make it, rather than 
those that do survive.

Also, let's define hardiness more broadly than just frost-hardy. For example, 
in my former marsh, a great many Japanese plants are not hardy because they 
cannot handle the wintertime sogginess. There is an obverse to this, plants 
that demand summer water to survive.

Cyclamen cyprium is an example here. It is currently surviving in a sheltered 
planter with overhead protection against the rain, but when we had an 
exceptionally cold winter, it failed in another sheltered spot after about 10 
years success.

Teucrium fruticans is another indicator. It thrived for years, but last winter 
put paid to it, even though we only had a couple of nights of seriously cold 

Rodger Whitlock
Victoria, British Columbia, Canada
Maritime Zone 8, a cool Mediterranean climate
on beautiful Vancouver Island…

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