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I'm hoping someone here can help me out with a gardening question. We're wanting to start a garden from scratch and need to get rid of a lot of grass. We hope to actually plant and seed our garden this year so glyphosate [round up] seems to be the most likely option for our purposes. The problem is that we bought round up from a local retail store previously and it did very little. I don't know if that's common or if what we bought may have been frozen. We carefully mixed and applied it according to directions. Would we have better luck buying it from a farm supply? Any recommendations would be appreciated.

Something to consider I feel  
 
https://youtu.be/Ng_PtxuUtNE

Roundup that is sold for garden use is a very different formulation and strength to that sold for farm use. Typically glyphosate can be frozen and then thaw with no loss of effectiveness.  
I’m not sure if a ag supply will sell glyphosate to a non farming customer. They likely shouldn’t.  
It’s a very safe product if used used responsibly and following label instructions. There is a lot of misinformation out there concerning the safety of glyphosate, much of it is not founded in good science and is inaccurate. It’s probably the safest herbicide available if used properly and respected. You should also consider the correct growth stages of target weeds before spraying any herbicide.  
Note some weeds have resistance to glyphosate  
A 10l jug of 540 formulation sprays 15 acres at full equivalent rate. Most homeowners don’t have 15 acres to cover or the equipment to safely and accurately apply the product.  
 
Edited by Farmergeorge, 2023-05-14 20:39:08

What is your garden going to be like? Lasagna beds might be your best bet. Google it, but the gist of it is to put down a layer of cardboard or similar and put layers of soil, mulch etc on top. We've started all our beds like that - the cardboard smothers the grass and you can plant shallow rooted crops the first year.

Thanks to all who responded. I have looked at lasagna gardening but most sites that I've looked at tell you to layer things in the fall for spring planting. I can see that it might work for shallow rooted plants though.  
As far as the round up goes, I wonder if freezing would tend to affect round up that is sold for household use since it's so diluted? It would be awesome if they would sell agricultural grade glyphosate in 1 litre containers. It's used extensively in farming so if you used it according to directions and took safety measures like the appropriate gloves and maybe a mask it should be fine. If there are any farmers out there who would like to sell me a litre it would be great, lol.  
I understand your concerns, Leonidas, and realize that there is a lot of controversy about glyphosate. I've read things on Gardening Fundamentals [Robert Pavlis] about it and he believes that it's safe when used correctly - although mostly I like to avoid chemicals in the home garden.

Alternatively ( and probably the best) is to dig the area manually and remove weeds and especially roots by hand.

on the size of the patch, you could use a turf lifter (or a spade)to take off the top couple of inches. Stack this upside down in a corner to rot down over the season.  
Alternatively you can cover the area with clear (not black) plastic, and let the heat of the sun kill off the weeds and seeds that are lying about.  
Perennial weeds like thistle, dock, nettle you can dig out as much as possible and treat regrowth with weedkiller.  
Whichever method you choose you will need to continue to hoe off weeds on a weekly basis, bearing in mind just how many years seeds remain dormant and viable. (think Flanders fields)  
Maybe put down weed control matting and then use timber edging to make a frame perhaps 8-12 inches high and fill with top soil, but that could be expensive.  
Another thought would be to put down cardboard, old carpet, matting and then use planters this year, which will also keep it weighed down.  
Good luck in whatever way you choose to proceed.

I don't think I've ever done it in the fall. I've always just done it in the spring, but I always have finished compost etc. I have a total of 8 beds I've done like that. We've also done like suggested above- basically remove the top layer and dig out roots etc. Amend your soil and away you go. Or use pots while you figure it out. Anything that holds dirt works!

Rent a sod cutter. It cuts the grass off in about foot wide strips. Then it can be rolled up and removed. Easiest way to get rid of the grass.

Black poly in the sun on a hot day will kill the grass.