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Weed barrier plantings for cold to temperate zones?


Joined: Feb 03, 2011
Posts: 32
I see Mollison suggesting canna and lemongrass plantings around gardens to block invasive weeds from spreading in.
There are weeds around my place that could really use a good thick barrier as well! Any ideas?
I likely need about 120-150'.... I guess it gets really expensive if you need to buy plants doesn't it?
Thanks for any ideas!
tel jetson

Joined: May 17, 2007
Posts: 3328
Location: woodland, washington
some folks use comfrey this way. just have to be sure not to disturb the roots. some folks use bunchgrasses, though I never have. bunching bamboos would work, though they are quite expensive.

what are you trying to keep out? the strategy could change depending on the weeds involved.

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Joined: Feb 03, 2011
Posts: 32
Thanks for the reply.
Trying to keep out canary reed grass, super invasive yet shallow rooted. Mollison mentioned how tropical weeds were pretty awful so maybe they are as bad as CRG.
Comfrey is a good idea- I'm guessing it spreads if you damage the roots? It spreads quite well for me without any fiddling- however maybe just hoeing around the edge of the barrier monthly will keep it from encroaching. Hmm. Weeds.
Travis Philp

Joined: Dec 28, 2009
Posts: 965
Location: ZONE 5a Lindsay Ontario Canada
Yeah, comfrey will most likely spread if you damage the roots.

Consider looking into Canada Lilly plant for your grass barrier. Around here they grow wild along roadsides, and they're also planted as an ornamental
Zone 5a in Central Ontario, Canada
duane hennon

Joined: Sep 23, 2010
Posts: 540
Location: western pennsylvania zone 5/a

maybe a double layer
Canada lily on the inside next to where you might be digging
comfrey on the outside next to the grass
both are pretty determined growers and will keep each other in check
Tyler Ludens

Joined: Jun 25, 2010
Posts: 5723
Location: Central Texas USA Latitude 30 Zone 8
Canada Lily {Lilium canadense) also has edible bulbs.

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Kellic kelwen

Joined: Jan 11, 2011
Posts: 27
Location: Northwestern Ohio, US
Bulbs our great for keeping the weeds out: garlic, flowers (lily), and even onions. Last year I used a comfrey in one corner of my garden, but it got really large so I used taller flowers such as lemon balm or black-eyed susan to provide some break between weeds and garden area.

"All this worldly wisdom was once the unamiable heresy of some wise man." Henry David Thoreau
Morgan Morrigan

Joined: Oct 16, 2011
Posts: 1400
Location: Verde Valley, AZ.
Since it is shallow rooted, you can just use wood ash. Will make it too alkaline to plant most anything else right there, so use a thin line of it, then plant something else just to the inside.

I like wooly thyme, especially cuz the oil from it will kill MRSA.

Essential oils will be big business in the future. Need a perfumers still to get it out tho.....

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subject: Weed barrier plantings for cold to temperate zones?