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3976Re: [pfaf] Cow's parsnip

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  • matthew@b-and-t-world-seeds.com
    May 5, 2009
      The best way to control this short lived weed is to prevent it flowering - setting seeds, it does not spread by off-sets (although it might regrow from the roots if not cut short enough).
      Seeds of Heracleum sphondylium/Heracleum maximum will wait in your flower bed for up to 7 years (until they are brought to light, a necessity for germination). If you are using no-dig garden methods you will not get new seedlings.
      If you are using heat to eradicate this species, you need to heat the soil to a depth of at least 4 inches, the temperature only needs to be about 140°F. Seeds are not often found far from the parent plants, most seedlings are found within 2 or 3 yards (diameter 18 feet).
      Heracleum sphondylium makes heaps of useful bio-mass and is easily prevented from seeding by cutting the plant, or even just the flowering spike, before it flowers - this is the time to eat the leaves and flower buds (the young stem shoots are best eaten early, before they become fibrous).

      Common sense weed control information from a commercial site:

      ----- Original Message -----
      From: Infowolf1@...
      To: pfaf@yahoogroups.com
      Sent: 5/5/09 5:42 PM
      Subject: Re: [pfaf] Cow's parsnip

      There is a small, narrow focus blow torch for jewelers, tiny, well,
      real small. This could be used directly on the weed, with a fire
      extinguisher in the other hand in case something went wrong.

      In a message dated 5/5/2009 2:39:35 P.M. Pacific Daylight Time,
      gardenchick1949@... writes:

      You could:
      1) mow or cut it down & put black plastic over it for a couple of weeks
      (hold down edges of plastic with heavy rocks)
      2) mow or cut it down & put newspaper or cardboard, then an organic mulch
      or compost over it.
      3) you could pour boiling water over it.
      4) you can use a flame. Per hgtv.com "You connect the supplied hose to a
      standard propane tank, then pass the flame (at a temperature of 2000
      degrees Fahrenheit) briefly over a weed. Almost immediately the weed will begin
      to turn dark green and show signs of wilting. Within a day or two, the weed
      will be gone forever. Of course, you wouldn’t want to use this in the
      midst of a drought or anywhere near flammable materials, but under safe
      conditions it can be a real timesaver."

      --- On Tue, 5/5/09, fastone123 wrote:

      From: fastone123
      Subject: [pfaf] Cow's parsnip
      To: _pfaf@..._ (mailto:pfaf@yahoogroups.com)
      Date: Tuesday, May 5, 2009, 1:06 PM

      Could someone please tell me a way to get rid of this very invasive plant
      .. I made a mistake a few years ago and transplanted a plant in my flower
      garden and now the sucker is everywhere and I am having trouble killing it ,
      Is agricultural vinegar considered to be organic ,I am using it and having
      some success but it is very expensive could some one please help John

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