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Old 12-08-2018, 02:31 PM posted to uk.rec.gardening
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Default Is it safe?

My daughter in law has turned over an old lawn which has had Evergreen 4 in
1 on it. Is it safe to plant/sow edible crops on the plot?
--
Jim S

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Old 12-08-2018, 04:07 PM posted to uk.rec.gardening
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Default Is it safe?

On 12/08/2018 14:31, Jim S wrote:
My daughter in law has turned over an old lawn which has had Evergreen 4 in
1 on it. Is it safe to plant/sow edible crops on the plot?


A quick and dirty test for any soil is will mustard & cress grow on it
without showing distortion of growth. If it grows OK then the weedkiller
has largely become deactivated or passivated by the soil.

Evergreen 4 in 1 doesn't contain anything too terrible. Something to
kill broadleaf weeds and moss and a bit of superphosphate.

https://www.lovethegarden.com/system...1%20015013.pdf

There are some commercial farm weedkillers that are incredibly
persistent and can be present in horse manure. There was an issue with
it a couple of years back causing trouble on allotments.

--
Regards,
Martin Brown
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Old 12-08-2018, 05:50 PM posted to uk.rec.gardening
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Default Is it safe?

On Sun, 12 Aug 2018 14:31:27 +0100, Jim S wrote:

My daughter in law has turned over an old lawn which has had Evergreen 4 in
1 on it. Is it safe to plant/sow edible crops on the plot?



How long ago was it applied and when did she turn the lawn over?

It contains MCPA and Mecoprop as weedkillers. MCPA breaks down with a
half-life of 24 days https://tinyurl.com/y9epmyme. Mecoprop breaks
down slightly faster https://tinyurl.com/y8rk35wc and scroll down. So
both should be down to pretty low levels after say four months,
assuming 'normal' conditions of moisture and temperature, which may
not have been the case recently.

The remaining components are fertiliser and sulphate of iron (moss
killer), neither of which will do her or her plants any harm.

The contaminated manure referred to by Martin contained either
aminopyralid or clopyralid. These are broad-leaf weedkillers used by
farmers on hay fields. They persisted on/in the grass which was
harvested for hay, which was then fed to horses in stables, and the
horse manure was subsequently used by allotment holders, with
distorted plants and crops as a result. Quite a chain!

--

Chris

Gardening in West Cornwall, looking E, Sheltered and partially shaded by trees to the W and SW


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