hort.net Seasonal photo, (c) 2006 Christopher P. Lindsey, All Rights Reserved: do not copy
articles | gallery of plants | blog | tech blog | plant profiles | patents | mailing lists | top stories | links | shorturl service | tom clothier's archive0
Gallery of Plants
Tech Blog
Plant Profiles
Mailing Lists
    Search ALL lists
    Search help
    Subscription info
Top Stories
sHORTurl service
Tom Clothier's Archive
 Top Stories
New Trillium species discovered

Disease could hit Britain's trees hard

Ten of the best snowdrop cultivars

Plant protein database helps identify plant gene functions

Dendroclimatologists record history through trees

Potato beetle could be thwarted through gene manipulation

Hawaii expands coffee farm quarantine

Study explains flower petal loss

RSS story archive

Re: Summer bloom

Chuck, that temperature doesn't seem to fit my casual observations of IMMORTALITY. Maybe there are still some other things going on with IMM & growth at temperatures lower than 102oF.

I don't have records, but the impression I've gotten over the years is that IMM shuts down when daytime temperatures are in the upper 90s, or at least when nighttime temperatures are above 70oF, regardless of available moisture. Or maybe it doesn't shut down completely, but slows to such a crawl that senescence keeps up with new growth?

I remember some discussion in this forum during the last century ;-), about MDBs respiring more C than they are able to fix because of warm night time temperatures. Maybe some cultivars have some of those same genes? If rebloom genes come from dwarf species...

<And max temp in day to not be above the critical (for cultivar) of heat dormancy, of about 102F .>
Linda Mann east Tennessee USA zone 7/8
East Tennessee Iris Society <http://www.DiscoverET.org/etis>
Region 7, Kentucky-Tennessee <http://www.aisregion7.org>
American Iris Society web site <http://www.irises.org>
talk archives: <http://www.hort.net/lists/iris-talk/>
photos archives: <http://www.hort.net/lists/iris-photos/>
online R&I <http://www.irisregister.com>

To sign-off this list, send email to majordomo@hort.net with the

Other Mailing lists | Author Index | Date Index | Subject Index | Thread Index

 © 1995-2017 Mallorn Computing, Inc.All Rights Reserved.
Our Privacy Statement