Embrace the mistake as the beginning of a new lifestyle. Roundup has cancer-causing chemicals that poison your yard and our water reserves, and cause abnormalities in local wildlife due to runoff. On the other hand, most plants referred to as "weeds" actually are edible, highly medicinal, anti-inflammatory and/or anti-cancer, plus are native and grow without any supplemental water or fertilizer or care or chemicals. They can save you a ton of money in produce at the grocery store and medical costs every year. The way you're doing it now actually it all backwards... so embrace the mistake!
To start you off, learn about the amazing health benefits of purslane, dollar weed, amaranth, and dandelion, which are 4 common Florida "weeds" which have high nutritional value, and are favored in other countries for their flavor in foods, not to mention their amazing medicinal properties. There's a huge amazing world out there we know next to nothing about, which would cure nearly all the ills of our "modern" society" if we were not so beholden to corporate interests that we kill the food and medicine that grows in our yards for free.