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growth regulators

Posted by alfred_grower Z7 VA (My Page) on
Mon, Mar 2, 09 at 8:34

I have Iris louisiana that are starting to get very tall, is there a growth regulator that works well and consistantly . I have tried using b-nine at various strengths but that had little or no effect. I believe bonzai will work but i have no experiece of using it.

if anyone has any advice it would be greatly recieved.

thanks Alf


Follow-Up Postings:

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RE: growth regulators

  • Posted by brandon7 6b (like 7b now) TN (My Page) on
    Thu, Apr 9, 09 at 10:51

I was thinking the same thing that Poly said in the Iris forum; why fight nature on an issue like this? If you are doing some type of research, that's one thing, but if you just want a shorter iris, get a shorter iris.


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RE: growth regulators

Bonzi is not labeled for outdoor landscape use. I've used it for various greenhouse crops, but iris is not one of them. I'd never use it on installed plants.


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RE: growth regulators

are you producing iris for sale commercially, or you planning to treat them in the landscape? low light and crowded conditions may result in plants that are stretched, or taller than is desired. under these conditions, they might respond to growth regulators. pgr's will only affect the new growth that is put on, not any leaves that are all ready too tall.

in commercial production, b-9 is labeled to be used with cycocel; combinations of the two are often more effective than either one alone. easter lilies and many bulbous crops respond to a-rest. check these labels for labeled uses and strengths. grower product news prints research on pgr's on various crops and might be a resource. gpn.com i think.


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RE: growth regulators

Many growth retardants work by interfering with gibberellic acid and/or brassinosteroid synthesis or response. Arrest (ancymidol) is only a gibberellic acid antagonist. If a plant doesn't respond to externally applied gibberellic acid, it won't respond to Arrest e.g., Alocasia macrorrhizos. Bonzi (paciobutrazol) and Sumagic (Uniconazole-P) are reputed to be both gibberellic acid and brassinosteroid antagonists. I have experience with Bonzi and I never met a plant that it couldn't shorten. Sumagic is reputed to be strong enough to shorten lawn grass but I never tried it.

Anyway, these typically shorten stems and petioles much more than leaves. Don't irises already have short stems and petioles?


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I forgot to mention

These are not very effective when applied as a foliar spray. They practically have to be applied as a soil drench in pots.


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