"martin" wrote in message
...
On 24 May 2004 13:17:35 GMT, emon (Rhiannon S)
wrote:

Subject: mares tail
From: Judith Lea
Date: 24/05/2004 14:08 GMT Daylight Time
Message-id:

Help, I have sprayed twice with Roundup - it is becoming very invasive -
any suggestions?

Move house?

Ok, on a slightly more practical note then, mares tail is almost
impossible to
kill and doesn't absorb roundup like most plants

Somebody, Franz?, said that if you trample on the part above the
surface first then the mares tails will absorb Roundup

(I'm sure someone here will be
able to give the scientific explanation for this).

It's got a waxy surface that repels liquids.


The only way to reduce mares tail is to keep digging it up, you'll never
get
rid of it, but if you keep at it, an hour or so a day, you reduce it's
visibility.

forever? :-((

As suggested, the external tissue is practically proof against absorption.
There are silicates involved and these will not dissolve.
To bruise the stems, is the best idea, prior to Roundup as some will then
be taken in. Very little absorption is needed for a kill. Give three weeks
between applications.
There is a Roundup advisory service that would be able to help. They might
suggest some additive that will slow down or stop the 'run off'
Good Luck Brian.