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using glyphosate near azaleas

Posted by fireweed_1947 Western Wa 8 (My Page) on
Mon, Nov 7, 11 at 1:17

Is it safe to use glyphosate outside the drip zone of rhody/azaleas? I have a raised bed with several azaleas of varying sizes. Am currently unable to weed this bed, & grass, etc., is moving in. I'm considering getting "down and dirty" using a spray bottle with a deflector shield. Thought this way I could keep the spray low and focused and not have to wet the soil as well. Your thoughts , please.


Follow-Up Postings:

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RE: using glyphosate near azaleas

  • Posted by botann z8 SEof Seattle (My Page) on
    Mon, Nov 7, 11 at 8:24

You can spray as close as you can, but don't get any Glyphosate on the leaves. Avoid mist setting where the product might drift onto the leaves.
Mike


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RE: using glyphosate near azaleas

Yippee! Thank you, Mike


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RE: using glyphosate near azaleas

Actually Glyphosate can be absorbed by any green tissue, so avoid green stems also. After being absorbed by green tissue it is transported to the roots. This is done more efficiently when photosynthesis is most active. Once it reaches the roots it kills them.

Ironically, if applied to the soil, the clay in the soil neutralizes Glyphosate before it can reach the roots.


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RE: using glyphosate near azaleas

  • Posted by bboy USDA 8 Sunset 5 WA (My Page) on
    Sun, Dec 11, 11 at 16:35

Except that azaleas are liable to have lots of roots quite high up in any organic litter layer that may be present on top of the soil.

C. Whitcomb (Establishment and Maintenance of Landscape Plants, revised 1991 edition) reports episodes where it really appeared there must have been root absorption of glyphosate. Trees were actually killed. On the other hand, L. Chalker-Scott (see her web site) says it doesn't happen.


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RE: using glyphosate near azaleas

Here is the link to this particular L. Chalker-Scott posting.

Here general website is:

http://www.puyallup.wsu.edu/~linda chalker-scott/horticultural myths_files/index.html

Here is a link that might be useful: The Myth of Wandering Weedkiller


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RE: using glyphosate near azaleas

I thought I was being careful, but lost a couple of young [2nd year] azaleas.


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RE: using glyphosate near azaleas

When I use glyphosate around rhododendrons and azaleas, there are a number of precautions I take:

1) use a very low pressure so the spray is a spray and not a mist.
2) only use glyphosate when there is no wind or very little wind.
3) have a barrier, like a piece of cardboard, to put between weeds and good plants. Plainly mark which is the contaminated side of the card.
4) wipe off any spray that gets on a good plant or, better yet, remove the leaf that was hit.

Using these precautions, I have never had any problems.


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RE: using glyphosate near azaleas

  • Posted by bboy USDA 8 Sunset 5 WA (My Page) on
    Wed, Jan 4, 12 at 21:09

A nurseryman here couldn't get rhododendron cuttings to root well after using glyphosate around the stock plants. You really want to be careful with herbicides, treated areas can look okay while non-target plants are actually being affected.


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