Problematic weeds in vege garden

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gregmcc

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#260097 10-Nov-2019 15:31

Have had these weeds growing in the vege garden for the past couple of years, I spayed roundup several times over winter but they have come back again this summer.

can anyone identify this and recommend a way to get rid of them for good

Dratsab

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#2351224 10-Nov-2019 16:39

Great bindweed, part of the convolvulus family. We have those too, as does huge swathes of the country. They're very tenacious. I've sprayed a fair bit over the years and pulled lots and lots of root systems out but they keep coming back, although nowhere near as bad as they used to be. A big part of the problem is they have such massive rhizome root systems the poison you're using (glyphosate) doesn't reach the whole system so it'll just keep growing back. Dicamba is what you need need for more effective treatment.

SATTV

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#2351233 10-Nov-2019 17:28

My big gun is Amatrole.

https://www.bunnings.co.nz/mcgregor-s-weedout-amitrole-herbicide-200ml_p00305183

This kills bamboo and that is bloody hard, roundup does not touch it.

Spray on new growth is best.

Be careful, Amatrole is nasty, if you accidentally spray something by mistake you need to wash it with lots of water immediately.

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k1w1k1d

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#2351242 10-Nov-2019 18:04

We have convolovus coming through from a neighbour. I spray any new shoots with a very strong roundup mix from a spray bottle. Nearly got it beaten?

Technofreak

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#2351246 10-Nov-2019 18:26

Doesn't convolvulus have bulbs (like daffodils)? Unless you dig out the bulbs it will keep regrowing.

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jonathan18

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#2351266 10-Nov-2019 19:42

Technofreak:

Doesn't convolvulus have bulbs (like daffodils)? Unless you dig out the bulbs it will keep regrowing.

I have a feeling you're mistaking convolvulus with oxalis; one has runners and incredibly long rhizomes, the other bulbs -

https://www.massey.ac.nz/massey/learning/colleges/college-of-sciences/clinics-and-services/weeds-database/great-bindweed.cfm

https://www.globalnetacademy.edu.au/what-weed-is-that-oxalis/

I've been told that breaking off a runner then dipping the remainder in Roundup (or chemical of choice, I guess) is more effective than spraying it.

We've got both it and oxalis, and both require more vigilance than I'm capable of.

Technofreak

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#2351268 10-Nov-2019 20:00

jonathan18:

I have a feeling you're mistaking convolvulus with oxalis; one has runners and incredibly long rhizomes, the other bulbs -

I think you're right

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Geektastic

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#2351298 10-Nov-2019 21:21

Get a goat.

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nickb800

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#2351354 11-Nov-2019 07:49

In general I have had good results with weedkiller that brushes on cut ends of the branches/roots

tdgeek

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#2351387 11-Nov-2019 08:27

Im on a crusade with Oxalis and Poa Annua. The time I spent setting up the vege gardens, they got away from me a bit

Oxalis I have sprayed with Tricopr. I figure I just need to bang away at that each time I see a new one, so that over time it is reduced, if the sprays can kill the roots in and near the exposed plant

Poa. I will spray with Roundup (Glyphocate) Ill end up with patches on the lawn. After 2 weeks I'll mow the patches down low, break up with a spade and/or thatching rake, then sow grass seed and cover with soil/compost mix. Again, If I bang away with this method, I hope to reduce the living rootstocks over time

dafman

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#2351400 11-Nov-2019 08:51

Anyone had second thoughts about using Roundup given the bad press of recent? I've switched to an organic weedkiller, only downside is its insanely expensive compared to Roundup.

tdgeek

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#2351407 11-Nov-2019 09:06

dafman:

Anyone had second thoughts about using Roundup given the bad press of recent? I've switched to an organic weedkiller, only downside is its insanely expensive compared to Roundup.

I feel that any chemical is a problem, so I dont bother with the media issues. I just take care with what I use