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Re: Culture

  • Subject: Re: Culture
  • From: Linda Mann <lmann@lock-net.com>
  • Date: Wed, 04 Apr 2007 09:12:27 -0400

Pearl, that looks like soft rot to me. Typical of susceptible varieties
when they get a heavy soaking after a long dry spell. It may not have
gotten to the rhizome yet, but I suspect if you inspect the roots, you
will see a lot of dead (suffocated/drowned) tissue. First the roots
rot, which cuts off the support system to the foliage, so it turns
brown, then the rhizome rots.

My theory is that some especially vigorous cultivars grow a lot of roots
into small voids in the soil that are perfect for them as long as it
stays dry, but when it rains a lot (8 inches in a week sounds like a lot
:-( ), those pockets fill up with water and kill the roots. Some
cultivars recover, especially if they can self prune foliage to get
roots and tops back in balance and if rot doesn't get started in the
Linda Mann east Tennessee USA zone 7/8
East Tennessee Iris Society <http://www.korrnet.org/etis>
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/>
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