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: Iris Dormancy

John I Jones wrote:
> I recently read in a local Iris club bulletin that if you were going to
> dig and separate an iris clump, that you should withhold water for six
> weeks to make tham go dormant. 

If they are going to be replanted almost immediately, 
I'm not sure that they should be dormant. They are 
certainly more able to resist rot when growing.

> It has been my impression that irises
> (TB's at any rate) go dormant on their own regardless of watering
> pattern. True?

I think it depends on the cultivar. Some rebloomers don't have 
summer dormancy. For many iris I'm sure you are right.

> Another question: How deep do iris roots (TB"S) typically go, and is
> that the depth at which one should be concerned about the availability
> of moisture? 

Depends a lot on the age of the clump. By the second or third year 12" or
so--first year around half that.

> I guess that is another way of asking how deep should it be
> dry before you water?

More than an inch, to let the outside of the rhizome dry off. 
Other than that, probably not too critical

Gerry, who took a while to learn that the "you don't have to 
water iris in the summer" rule that worked in Cincinnati doesn't 
cut it in the desert of Los Angeles.

  • References:

 © 1995-2017 Mallorn Computing, Inc.All Rights Reserved.
Our Privacy Statement
Other Mailing lists | Author Index | Date Index | Subject Index | Thread Index