The fastest way to kill weeds depends on what you have on hand and how much time you want to spend
You can kill weeds by pulling them by hand, cutting them below the soil line with a hoe or knife, spraying them with herbicide, pouring boiling water on them, or smothering them with mulch or cardboard. Hand-pulling works best on young weeds and in small patches. Hoeing is faster for larger areas. Herbicides kill the roots so weeds don't regrow as quickly. Boiling water and mulch are chemical-free options that work well around vegetables and flower beds where you don't want to use sprays.
The method you choose depends on three things: how many weeds you have, whether you want to use chemicals, and how soon you need them gone. A single dandelion in a flower bed calls for pulling. A driveway covered in crabgrass calls for a different approach. This guide walks you through each method so you can pick the one that fits your situation.
Key Takeaways
- Hand-pulling works best on weeds with shallow roots and on soil that is wet or freshly watered, when the whole plant comes out more easily.
- A sharp hoe or spade cuts weeds below the soil line in seconds and prevents regrowth if you catch them before they flower.
- Herbicide sprays kill the roots and prevent new growth, but take several days to work and require you to follow label directions for safety.
- Boiling water kills weeds when ready and leaves no chemical residue, but you must pour it carefully to avoid burning nearby plants you want to keep.
- Mulch and cardboard smother weeds over weeks by blocking sunlight, and work best as prevention before weeds take hold.
Hand-pulling: best for small patches and young weeds
Hand-pulling removes the entire weed, including the roots, so it does not regrow from the same plant. Grab the weed at the base as close to the soil as you can, and pull straight up with steady pressure. If the weed snaps off and leaves roots in the ground, dig down with a small knife or weeding fork and remove what is left. Weeds with taproots—like dandelions and thistles—need you to get the whole root out, which can be 6 to 12 inches deep.
The easiest time to pull is right after rain or after you water the garden, when soil is soft and roots slide out cleanly. On dry soil, roots break and pieces stay behind. Wear gloves if the weed has thorns or if you have cuts on your hands. Pull weeds before they flower and set seed, or you will be pulling their offspring for months. This method takes longer than hoeing if you have hundreds of weeds, but it is the safest around vegetables and flowers because you control exactly where you pull.
Hoeing: fast for large areas and established weeds
A sharp hoe or spade cuts weeds below the soil line in one or two strokes, which kills most annual weeds and stops perennial weeds from regrowing that season. Angle the blade so it slides just under the soil surface—about half an inch deep—and chop or drag it toward you. You do not need to dig deep; you just need to sever the stem from the roots. Work on a dry day so you can see the weeds clearly and the soil does not clump on your tool.
Hoeing works well on driveways, patios, and garden rows where you have space to swing the tool. It is much faster than pulling if you have dozens of weeds spread across a large area. The downside is that perennial weeds with deep roots—like bindweed and dock—will regrow from the roots left in the soil. You will need to hoe them again in two to three weeks when new shoots appear. Keep your hoe sharp; a dull blade bounces off hard soil and tires you out.
Herbicide spray: kills roots and prevents regrowth for weeks
Herbicide spray soaks into the leaves and moves down to the roots, killing the whole plant so it cannot regrow. There are two main types: contact herbicides kill only the part of the plant they touch, so they work best on young weeds. Systemic herbicides move through the whole plant and kill the roots, so they work on larger weeds and prevent regrowth. Glyphosate (the active ingredient in Roundup and store-brand versions) is a common systemic herbicide. Read the label to see which type you are buying.
Spray on a calm, dry day so the spray lands on the weeds and does not drift onto plants you want to keep. Spray the leaves until they are wet but not dripping. Most herbicides take three to seven days to work; the weed will look dead or dying by then. Wear gloves and long sleeves, and keep children and pets away from the sprayed area until it dries. Never spray near a vegetable garden unless the label says it is safe to do so. Some herbicides kill any plant they touch, so you must be careful where you aim.
Boiling water: when ready kill with no chemicals
Boiling water kills weeds on contact by destroying the cells in the leaves and stems. Boil a kettle of water, carry it carefully to the weeds, and pour it slowly over the base of each plant until the soil around it is soaked. The weed will wilt and die within hours. This method works on any weed and leaves no chemical residue, so it is safe to use around vegetables, pets, and children.
The main risk is burning yourself or nearby plants you want to keep. Pour slowly and carefully, and warn anyone nearby that you are working with boiling water. Boiling water works best on weeds in cracks in concrete, on driveways, and in isolated spots where you can pour without splashing. It does not work well on large areas because you would need many kettles of water. The weed will die, but the roots stay in the soil, so new weeds may grow from the same spot later.
Mulch and cardboard: smother weeds over time
Mulch and cardboard block sunlight and prevent weeds from growing in the first place. Lay cardboard flat over the weeds, overlap the edges by at least 6 inches so weeds cannot creep around the sides, and wet it so it stays in place. Cover the cardboard with 2 to 3 inches of mulch—wood chips, straw, or shredded leaves work well. The cardboard breaks down over several months while the mulch stays in place and keeps new weeds from sprouting.
This method works best as prevention before weeds take over, or on top of weeds you have already killed by another method. If you lay cardboard over living weeds, they will push through or regrow around the edges. You can also use landscape fabric under mulch, though it is more expensive than cardboard and lasts longer. Mulch also keeps soil cool and moist, which is good for most plants. Avoid piling mulch against tree trunks or plant stems, as it can trap moisture and cause rot.
Choosing the right method for your situation
Start by counting how many weeds you have and how much space they cover. A handful of weeds in a flower bed is a pulling job. A driveway full of crabgrass is a hoeing or herbicide job. A large garden bed you want to protect is a mulch job. Next, think about whether you want to use chemicals. Herbicides are fast and thorough, but boiling water and pulling are chemical-free. Finally, consider how much time you have. Pulling and hoeing take an hour or two but work when ready. Herbicides and mulch take longer to work but require less physical effort.
Most gardeners use a mix of methods. Pull weeds in flower beds where you are careful about what you spray. Hoe the vegetable garden. Use herbicide on the driveway where nothing else grows. Lay mulch in new beds to prevent weeds before they start. The best weed control is catching them young and small, before they flower and spread seed. Check your garden weekly and pull or hoe any new weeds you see.
Frequently Asked Questions
Will weeds come back after I kill them?
Annual weeds die completely once you remove the plant, but perennial weeds regrow from roots left in the soil. Hand-pulling and hoeing work best if you remove the entire root. Herbicides kill the roots, so regrowth is less likely. Boiling water kills the top but leaves roots, so the weed may regrow. Mulch prevents new weeds from sprouting but does not kill roots already in the soil.
Is it safe to use herbicide around vegetables?
Most herbicides kill any plant they touch, so you must keep them away from vegetables. Read the label to see if the product is safe to use near food crops. Some herbicides are designed for vegetable gardens and will not harm them if you follow directions. When in doubt, use hand-pulling, hoeing, or boiling water instead.
What is the best time of year to kill weeds?
Spring and early summer are best because weeds are young and small, and soil is often moist from rain. Pulling and hoeing are easiest then. Fall is also good because you can lay mulch before winter. Summer is harder because soil is dry and weeds are large and tough. Winter is slow because most weeds are dormant, but you can still pull or hoe on mild days.
Can I use salt to kill weeds?
Salt kills weeds but also damages soil and can harm nearby plants, so it is not recommended. Salt builds up in the soil over time and makes it harder for any plant to grow. Boiling water, herbicide, or pulling are safer choices that do not leave salt behind.
How do I stop weeds from coming back?
Lay 2 to 3 inches of mulch over garden beds to block sunlight and prevent new weeds from sprouting. Pull or hoe any weeds that do appear while they are small. In spring, before weeds flower, spend 15 minutes a week checking your garden and removing new growth. The more often you remove weeds early, the fewer seeds they drop and the fewer weeds you will have next year.