There is no homemade mix that reliably kills every weed permanently without trade-offs like soil damage or regrowth.

Common DIY “Weed Killer” Recipes (and what actually happens)

1. Vinegar-based spray

Vinegar is one of the most common ingredients used.

What it does:

• Burns the leaves of young weeds
• Works best in hot, sunny weather

Limitation:

• Usually does not kill roots
• Weeds often grow back

2. Salt mixture

Salt is sometimes added for stronger effect.

What it does:

• Dehydrates plant cells
• Can kill small weeds on contact

Big problem:

• Can damage soil for a long time
• May prevent anything from growing in that area

3. Boiling water

Water (heated) is also used.

What it does:

• Kills surface plant tissue instantly
• Works well for cracks in pavement

Limitation:

• No root removal → regrowth is common

4. Soap + vinegar mix

Dish soap is sometimes added to help the spray stick to leaves.

What it does:

• Improves contact with plant surface
• Slightly increases leaf damage

Limitation:

• Still not a long-term solution

Why these recipes “seem to work”

• Leaves die quickly → looks effective
• Roots stay alive → weeds return later
• Social media shows only short-term results

What actually works long-term

If the goal is lasting weed control:

• Mulching (blocks sunlight)
• Landscape fabric under gravel
• Regular hand removal (roots included)
• Targeted herbicides (if appropriate and used safely)
• Dense planting to crowd weeds out