Re: Clopralid (Alligare)
iris@hort.net
  • Subject: Re: Clopralid (Alligare)
  • From: L* M* <l*@lock-net.com>
  • Date: Fri, 31 May 2013 16:42:48 -0400
& I'm pretty sure Clopyralid is the one they were talking about. It's been banned some places. 

But yeah, be careful using purchased mulch material.
How fast these various chemicals break down depends on a lot of factors, including temperature, moisture, sunlight and/or the wee boogers that break them down. & "they" are reporting possibilities of changes in soil ecology after using my old favorite, the relatively benign Roundup. No idea how persistent those changes might be, especially in a garden setting with all kinds of amendments added (mulch, manure, etc0.
Colleen, some cultivars may not like mulch, & it probably depends on soil and climate, but I use chip mulch on my seedlings and some older 'survivors' here with good results. Except for the sheep sorrel! All of the I. germanica here is growing under the drip line of my tin roof (no gutters),so gets buried in tree leaves and runoff from the roof every year. They are thriving, bloom heavily most years. Most of the leaves falling on the roof are fast decomposing types - buckeye, elm, hackberry, pear. Not sure if that matters. With chip mulch, they need a bit more N than otherwise. 

On 5/31/2013 4:12 PM, Colleen wrote:

The article was actually talking about the dangers of using horse
manure if the animals had been fed seed-free, "horse quality" hay.  It said
that the residue from the chemicals can go right through the compost pile
and kill your plants.  I had never thought of that risk.

Colleen in NE Calif.


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