If buying 30% vinegar, and mixing it 1 to 1 with water, you have 15% vinegar. Typically 15% costs less than half the price of 30%. You are spending extra money needlessly.
Remember, vinegar changes the soil. It takes a long time for it to dissipate. During those months, it will make growing stuff you want a lot harder. It will spread to your good landscaping and harm it. Weeds are a lot more tolerant. They will regrow while the shrub next to them dies.
Salt acts the same way.
Roundup kills the vegetation it contacts because it gets absorbed into it. What is left around, in sunlight, changes into an inert form. No longer toxic to anything. It does not kill other vegetation going forward.
The cancer lawsuit lawyers are targeting farmers and landscapers that spray it every day. In windy conditions that blow it back into their faces, and they breathe it often. We are smart enough, and have the flexibility, to pick calm days to spray it. We use it in tiny amounts. I have zero fear of it.
If having to deal with weeds more often than once after several months, you are doing something wrong. Weekly is a total failure.
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