Parallel regions

J.E. Shields
Fri, 20 Nov 2009 07:12:45 PST
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?

I can grow the following here, with survival times of several years or longer:

Arisaema heterophyllum, stewardsonii*, triphyllum
Chionodoxa lucilae
Colchicum autumnale, byzantinum, cilicicum, speciosum
Corydalis angustifolia, solida
Crinum bulbispermum, variabile
Crocosmia 'Lucifer'
Crocus tommasinianus, nudiflorus, cartwrightinaus
Fritillaria acmopetala, crassifolia kurdica, pallidiflora
Galtonia candicans*
Gladiolus caucasicus, imbricatus, italicus, oppositiflorus salmoneus
Hemerocallis coreana, dumortieri, minor, thunbergii
Iris delavayi, sanguinea, setosa, siberica cvs., tectorum, versicolor
Lycoris caldwellii, chinensis, longituba, sprengeri, squamigera
Narcissus calcicola*, obvalleris, large-cup cvs.
Scilla siberica
Sternbergia lutea
Trillium sp.

* indicates survives in restricted locations

The list above includes local native species as well as exotics.

So I would say that, here in Indiana, we approximate the wetter, colder 
parts of Central Asia and China.  We definitely have a continental climate, 
modified by the influence of the Gulf of Mexico, which is only about 1000 
miles/1600 km away.  Things that are very resistant to severe cold but need 
to be really dry for part of the year require special locations to survive 
here.  Things that cannot tolerate humid heat in summer -- most alpines -- 
cannot survive here.

We are a far cry from the moderate maritime climates of the world!  We can 
do a better approximation of a desert than of England.  Our winter low 
temperatures reach -10 to -20 F/-23 to -29 C on occasion and hover at ca 0 
F/-18 C for days at a time in winter; snow cover is spotty and usually of 
short duration.   Summer highs average 86 F/30 C in mid-summer, topping out 
at around 95 F/35 C.  We have 35 to 40 inches/ca. 90 to 100 cm of 
precipitation (as liquid) per year, rather evenly spread over all 12 months.

Jim Shields
in central Indiana
in the wet eastern half of the Midwest

Jim Shields             USDA Zone 5             Shields Gardens, Ltd.
P.O. Box 92              WWW:
Westfield, Indiana 46074, USA
Tel. ++1-317-867-3344     or      toll-free 1-866-449-3344 in USA

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