The hot/boiling water works especially well for annual weeds, since hey tend to have shallow roots. If you make ice cream, you can use the salt water from the freezing process to pour over weeds also. Just be sure to watch where you pour it since the salt will kill almost anything.
Yeah, I'm watching the thistle to see if it comes back. But the clover and yarrow that I boiled 2 weeks ago is completely dead and gone. And the boarder around the patio that was all grass that I boiled is also clean and grass free, so I think that's OK. I boiled some dandelions on Wednesday; they were small-ish so I don't think the roots were too establishes, but I will watch them, too. I'm just pretty happy to be able to get a second use out of the water that I put resources into in the boiling of, and that it will mean less weed pulling for me!
I'm not sure if this is a true organic weed killer, but I "discovered" a new way to kill weeds in my yard and patio this fall. I have been on a big canning kick this year and have had many large pots of boiling water to do something with. I needed my stove for some other cooking a bit ago so I took my big pot of boiling water out the back door and splashed it across the patio. There were a few weeds and tufts of grass growing up between the pavers that got splashed. To my surprise, the next day when I went out, the weeds were all completely wilted!
So every pot I've created with my canning this fall, I have taken out back and poured the boiling water along the borders of my flower beds and directly on weeds coming up in the lawn. It does kill everything, so I have spots in the lawn where the water was poured, but it's no worse than the spots that my dog leaves! And it's completely effective on all weed plants-thistles, dandelions, clover, grasses, etc. Easy and cheap weed control, nice combo!
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