Preventing Weeds In a Flower Garden

I have a black thumb, but I squirted some plain apple cider vinegar on a weed that was growing between some bricks and in two days it was gone.

I don't know what would happen if you used it around flowers; would the flowers die too?

You can plant lot of small glad bulbs & flowers to choke out the grass & weeds or do as we did with my garden. We made a 30x20 foot garden in our back yard with plastic and cement blocks. You do not have to remove grass. Put down plastic or a thick layer of news papers, and place cement blocks on top around the edge of the space. Then, fill it with composted manure. You have a garden without weeds or grass for years. Add more compost as needed every year. I get manure from Lowe's in 40 pound bags, I have a garden all the year, I also make flower beds the same way.
Good luck.