Re: SIB: Sun requirements

From: GWhite & LRader <bentfork@navix.net>

Karen,

    I have 2 large beds full of beardless irises (Siberian, Japanese, and
Louisiana Irises) that are shaded for about half the day.  They get good morning
sun, but are shaded in the afternoon.  All of these seem to do well under these
conditions.  I have had lots of bloom on the siberians this year and have good
bloom stalks on both the Japanese and Louisiana iris plants.  The plants also
appear in good shape with no chlorosis due to lack of sunlight.  I think that
afternoon shade actually benefits Siberian and Japanese irises during hot
summers.  The afternoon temperature is a few degrees cooler in shade, of course,
than in full sun.  Southeast Nebraska is in USDA Hardiness Zone 5a, but in
American Horticultural Society plant Heat-Zone 7.  Heat Zone 7 means that there
are 60-90 days per year in which the temperature is 86 degrees F (30 degrees C) or
higher.  I think that the extra protection from the sun that these plants get in
the afternoons, as well as slightly cooler temperatures, and more moisture
retention is very important during these hot, dry periods in the summer.

Gary White
Lincoln, NE


Karen Jellum wrote:

> From: Karen Jellum <7kjellum@3rivers.net>
>
> Does anyone have a pretty accurate idea of how many hours of sunlight a
> siberian needs?  I want to plant a siberian as a background behind a
> birdbath, but there is partial shade for some of the day.  As much as I love
> the siberian foliage, I would like it to bloom.  Are some more shade tolerant?
>
> Karen
> Zone 3, Chinook Montana
> Orville Fay and Flight of Butterflies are still blooming
>
>




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