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ATTENTION - Ban on Gunnera plants

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  • Very surprised by this.  We have cultivated Gunnera for several years adjacent to our wildlife pond, in a wettish area.  It has spread in a localised way colonising an area of a couple of square metres.  It is not even slightly invasive and we are careful to protect it in winter to avoid frost damage to the crown.  Can't help thinking that this is a "problem" that is greatly exaggerated.  We shall be retaining ours and probably seeking to create more.  
  • ObelixxObelixx Posts: 30,090
    By a pond, it's fine.   Next to a stream it can become a problem as it can travel and disperse. 
    Vendée - 20kms from Atlantic coast.
    "The price good men (and women) pay for indifference to public affairs is to be ruled by evil men (and women)."
    Plato
  • Its invasiveness depends entirely on the conditions where it grows.  If it's dry, or cold in winter, its spread is checked, as @bertrand-mabel and others find.  However, if it's growing in a damp, mild area like western Ireland (Mayo, for instance) it can spread really rapidly and shade out all native vegetation, as it doesn't get a winter check.  See picture below:
    https://www.natureinstock.com/search/preview/gunnera-tinctoria-invasive-plant-species-growing-on-large-tracts-of-land-on/0_12093384.html

    Since 2019 I've lived in east Clare, in the west of Ireland.
  • punkdocpunkdoc Posts: 15,039
    Darmera may be what you are thinking of, @Ergates, I grow it.
    How can you lie there and think of England
    When you don't even know who's in the team

    S.Yorkshire/Derbyshire border
  • Hostafan1Hostafan1 Posts: 34,889
    edited December 2023
    Gunnera self seeds in my garden
    Devon.
  • FireFire Posts: 19,096
    Obelixx said:
    I believe the problem arises when the gunnera is planted next to running water which can wash its seeds to new places for it to grow

    Running water is so often the method for invasive species to spead. Gunnera can grow from a tiny bit of rhizome as well as by seed.




  • I've never seen it in the wild here but a few gardens have it as do the water gardens connected to the broads system, where I haven't heard it's spread. I'm a little surprised but not shocked that it's been banned as it always seems to be a case of shutting the door after the horse has bolted. I also don't think it could be as big a problem as with himalayan balsam, simply because it's not as vigorous and is easier to eradicate if need be. I don't have a problem with the ban though .
     
    Rheums could be a nice substitute for somewhere moist and tetrapanax if it's drier.
  • @thevictorian Himalayan balsam is a shallow-rooted annual which spreads readily by seeds, which shoot out over a wide area.  But it's easy to pull up and compost, though getting rid of a big stand of it along a canal, for instance, takes a considerable effort.  Gunnera, however, is perennial, and as @Fire says, can re-grow from a tiny bit of root left in the soil, as well as from seed.  It's not invasive everywhere in Britain and Ireland, since it needs mild winters and a damp climate to thrive, but banning it only where it's currently a problem wouldn't be possible - and climate change might well affect its spread, anyway.  And the only practicable way to eradicate it is by using herbicide... 
    Since 2019 I've lived in east Clare, in the west of Ireland.
  • FireFire Posts: 19,096
    McRazz said:

    DEFRA once again bringing a teacup to douse the flames of the bonfire that is our compromised environment.  

    I entirely agree. We have a govt running regulation that hates having regulations. And so we have rivers, oceans, air, food, health and woodlands trashed. They just shrug and say it's a dog eat dog world. It's the central paradox (read: pointlessness) of having a group that celebrates the "bonfire of regulations" setting regulations (their phrase).





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