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Squares under siege... by grass!

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Squares under siege... by grass!

Post  Coelli on 6/29/2012, 3:44 pm

My boxes are on top of what was a neglected lawn; it was probably mostly native grass when we moved in. When I put the boxes down we used a layer of weed block fabric and some newspaper. Apparently this was not enough. Sad

I am constantly pulling grass out from my SFG boxes. It comes up in several places every day and I usually get it before it's an inch or two tall, reaching as far down along the stems as I can in the hopes of getting the roots up too (with about a 75% success rate). I recently put more weed block down around the boxes and entire garden up to the fence perimeter and added about 2" of bark mulch on top.

I have these dark fears that the grass roots system is permeating the boxes from the bottom up and choking everything out. Will it ever run out of juice and die off and stop coming up? Or at some point will I have to start the boxes over with more drastic measures underneath?

Coelli

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Re: Squares under siege... by grass!

Post  rowena___. on 6/29/2012, 4:55 pm

sounds like bermuda grass, which is what we have. you'll need to keep pulling it. eventually it will slow down but it will never go away completely. it won't ruin your garden. presumably you are out there every day, so you just pull pieces when you see them.

the first few years they will be tenacious. by the third year they will slow down. by the fourth year, they will be soft wisps that come out easily.

rowena___.

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Re: Squares under siege... by grass!

Post  Coelli on 6/29/2012, 8:17 pm

Well, that's good news! I am planning to eventually expand those beds to 4x8, so I'll "salt the earth" under the weed block and use many more layers next time before filling the new space. I'm thinking lots of baking soda or vinegar might help poison it without being too toxic.

Coelli

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Re: Squares under siege... by grass!

Post  rowena___. on 6/29/2012, 9:05 pm

salt and vinegar are non-selective. they will kill any plants in the box.

rowena___.

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Re: Squares under siege... by grass!

Post  Coelli on 6/29/2012, 9:30 pm

I have 12" boxes, so I figured I would lay down the vinegar or baking soda, let it seep in for a few days, then put several layers of weed block down over it and then fill the boxes. By the time any plants get down there the water coming from the boxes over time should have washed the weed-killer down into the earth below the boxes. I would definitely not use it *in* the boxes!

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