Chelsea Christenson wrote:

My master gardener suggested a solution of vinegar and water for
killing the weeds that come up between the bricks in my patio.
Unfortunately, she's on vacation now, so I can't ask her: what is the
correct ratio of vinegar to water?

3 parts vinegar, 1 part virgin olive oil, mix well and pour on
raddiccio.

I tried STRAIGHT vinegar on bermuda grass and it's thriving
(after three applications, no less).

I went back to using Roundup.

Tsu

--
To doubt everything or to believe everything
are two equally convenient solutions; both
dispense with the necessity of reflection.
- Jules Henri Poincaré