Oxalis weed problem HELP

Hi to all. Having been moving around some soil in my backyard to get it prepared for sir walter instant turf, I have unfortunately given life to a particular weed called Oxalis. Been to bunnings with the sample, and they have informed of the weed and said it is extremely resistant and might need 4-5-6 times with the roundup concentrate to kill it. It has appeared everywhere over my bare soil roughly 60mtrs in area.

I think they must have been lying dormant and when I dug out other areas of the garden and spread the soil to areas where I am going to lay sir walter, they must have come alive. They are a green leafy weed with a white stem and a brown bulb right at the bottom of it.

Mind you, I still need to spread another 100mm of sandy loam, and then get the instant turf on top, so my question is.

- even if it doesnt get fully killed, will the sheer mass of sandy loam and instant turf stop it from coming thru.
- If i end up killing it, should i rotary hoe the area to try to remove the dead weeds before turf preparation, or will this start more oxalis to appear.

I have applied a roundup powermax once 7 days ago, and no signs yet, but will give another dose this weekend.

Any help will be great.

Yes it is a PITA and requires repeated attention with the Roundup. The problem is the small bulblets on the roots which is is very hard to get at with hand weeding and which shoot continuously even when you think you have got it all. At least Roundup kills the bulblets associated with each plant you attack rather than breaking the plant up into a dozen new clones, which hand weeding me also do if you cannot get at the roots. Applying the Roundup with a paint brush may help to reduce damage to the rest of your turf. Sounds like a pain, but so is oxalis! :doh::doh:

to really beat it, you have to apply your spray when it is in flower

Bloody oxalis has just started to give into my demands, and is showing signs of old age. Needed 3 sprays over 6 weeks to take effect, also will give it another spray next week.

Shall I just lay sandy loam over the top for turf preparation or should I dig the dead oxalis out. Dont wanna see the oxalis coming out of my new sir walter turf when I lay it down later on.

dont try and dig it out, you will end up with the same prob and spread it further. Inevitably some will pop up, but mowing a lawn will eventually tire it out. If all else fails you can get a broad leaf specific herbicide that will kill the oxalis but not the buffalo.
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I have been able to defeat it very quickly but time consuming.
All I have been doing is let it grow by not mowing the area and with some length to the weed
I have then applied full strength roundup by applying it by using rubber gloves straight onto the weed covering the whole leaf in poison.

If you try this method make sure you purchase gloves for poison the kitchen washing
up variety ones are no good as they absorb the poison through the glove and get onto your skin.

Killing this stuff can be easy or hard. Overall I would not be at all concerned with it being in an area to have turf laid.
Don't be fooled by horror stories. It is going to show up later anyway so why bother sterilising and nuking every living thing in the soil with these poisons. It is the living organisms you can see that will ensure your new turf goes well for a very long time to comer.

When using any selective or non selective weed spray it really is a waste of money to use non diluted strength weed killers. Many products will be rendered ineffective when we up the dosage rates. The neat round-up (or any comparative Glypho product) may very well have been equally effective when used at weaker rates.

Timing is going to have an impact on the effectiveness of your spraying. Yep flowering is a good time to spray but so is getting it actively growing. (relates to any plant). Always spray in the morning. The later in the day the less effective the treatment will be. This is because the plant will nod off sort of overnight and sprays on the leaves will oxidise and be useless or less effective by the next morning.

A few drops of dishwashing liquid (preferably an eco friendly one) in your sprayer after filling and a splash of seasol as well. This will amplify the effects of your spray in a way. They are absorbed far more effectively. This method is often the difference between it working or not. Urea or sulphate of ammonia are also used at the rate of a table spoon per 10 ltrs. Seasol has been found to be far more effective though.

Just lay the turf, ignore the Oxalis or any other weeds for that matter and use soil amendments like bentonite clay (in snady soils) zeolite, spongolite and of course heaps of molasses after the turf has been laid to feed the living soil. Heaps of orgainc compost as weel and mixed through to about 200-300mm. This will result in beautiful trouble free turf that hardly needs fertiliser or water to look perfect.

Once the turf is down a product called Amgro "Bin-Die" is the spray of choice. The same as buffalo master and way cheaper. Can be used on any turf. It will take care of the oxalis that reappears or any broadleaf weed for that matter.

Just wait till the turf has established. Don't be concerned with the weeds in the mean time because remember you can sort them later.