The best home remedy for garden weeds is boiling water poured right on the plants. It kills weeds on contact and leaves no chemical residue in your soil. Vinegar and salt get a lot of attention online. The research tells a different story about how well they work.
I spent a whole summer testing every natural weed killer DIY recipe I could find online. My kitchen vinegar at 5% acid did almost nothing to the weeds in my driveway cracks. The leaves browned a little but the plants bounced back within a week. Boiling water killed those same weeds dead in one application and they never came back.
Most household vinegar weed killer fails because of weak acid content. Your kitchen vinegar has about 5% acetic acid which is too weak to destroy weed cells. NC State research found you need 20% acetic acid to kill 86-96% of common weeds. That stronger vinegar costs three times more than store herbicides and can burn your skin.
Boiling water works because it destroys plant cells through heat instead of chemistry. You pour it on the crown of the weed where stem meets soil. The heat travels down into the roots and kills the whole plant at once. This method works great for weeds in sidewalk cracks, patios, and gravel areas where you do not need to protect other plants nearby.
Salt kills weeds but it also ruins your soil for years to come. One gardening neighbor spread salt on her walkway weeds and nothing grew in that strip for three full seasons after. The salt spread into her flower bed and damaged her roses too. I never recommend salt for any garden use at all.
If you want to try vinegar weed killer, use it only on young seedlings far from plants you care about. Spray on a hot sunny day when the acid and sun work together on the leaves. Do not expect it to kill mature weeds or anything with a deep taproot. You will just waste vinegar and get frustrated with the poor results.
Stick with boiling water as your main home remedy weapon against weeds. Keep a kettle on the stove and attack weeds when you spot them popping up. The hot water kills fast, costs nothing, and never harms your soil. Your garden stays chemical free and you get the satisfaction of watching weeds wilt in seconds flat.
Read the full article: Controlling Garden Weeds: 8 Methods That Work
