Here’s a tip your grandmother probably knew: boiling water is shockingly effective. Pour it directly onto the leaves of weeds growing in cracks on your driveway or patio. The heat instantly ruptures the plant cells, causing it to wilt and die within hours.
Fun fact: This method works best on annual weeds like chickweed or bittercress. For perennials with deep taproots, like dandelions, you might need a repeat performance. But for zero cost and zero chemicals, it’s a satisfying start.
The Vinegar Solution—But Not Under Your Sink
Household vinegar (5% acetic acid) is great for salad dressings, but it’s a wimp against established weeds. What you need is horticultural vinegar (20% or higher acid). Mix it with a squirt of dish soap in a spray bottle, and apply on a sunny day.
The soap helps the vinegar stick to the leaves, and the sun burns it in. Important: This is a contact herbicide, meaning it only kills what it touches. It won’t travel to the roots, so it’s best for young weeds or top growth. Also, wear gloves and goggles—that stuff is potent.