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Re: TB: When to Divide Clumps?


It's best to divide a clump before the rhizomes all start crowding each other and you end up with a lot old dead rhizomes in the middle and rhizomes on top of each others. How long this takes depends on the cultivar. For something that increases quickly like Doubleshot or Epicentre this will be only a few years. On the other hand Hello Darkness might never need transplanting.

Colleen Modra
Adelaide Hills
South Australia


----- Original Message ----- From: "Williams, Michael" <Michael.Williams@hgtc.edu>
To: <iris@hort.net>
Sent: Wednesday, June 14, 2006 5:50 AM
Subject: [iris] TB: When to Divide Clumps?

I recently visited a daylily nursery, and on one of the "facts
brochures" they provided, they said that a clump of daylilies should not
be divided until it has around 20 fans. I have never seen any number
like this associated with iris clumps, but I have some second and third
year clumps which I am not sure I should keep intact or separate. They
all have nice healthy big rhizomes which have grown on all sides of the
long expired mother rhizome, so should I assume that these rhizomes will
reproduce their own fans as well? They all have room to spread out.

How big does a clump get before you decide for sure that it is time to
divide it? Any advice you can give me?

Mike, Zone 8

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