For the best lawn weed killer that also kills crabgrass, Bayer Advanced 704140A All-In-One Lawn Weed and Crabgrass Killer Concentrate is the one for you. To be most effective, users have said to add a teaspoon full of liquid soap to the mix. This allows it to stick to crabgrass leaves for more effective control. You may need two or three applications to kill crabgrass, but broadleaf weeds will die after one application. It's rain safe after one hour, but no mowing for two days before and after application and apply after two or three days of rain or watering. There are other lawn weed killers available, but none work better than this.
For effective control of all weeds in a lawn, Ortho Weed-B-Gon Weed Killer for Lawns Plus Crabgrass Control will do the trick. It comes in both concentrate and ready-to-use varieties, and will kill broadleaf weeds in one application, while taking two or more applications to kill crabgrass. It must be applied when the grass is dry, and can be watered and is rain safe after one hour. Do not mow two days before or after, and for best results, apply after watering or rain has occurred two or three days before.
If you want the safest crabgrass lawn weed killer, Agralawn Garden Weasel AG Crabgrass Killer is the best choice. It is made of powdered cinnamon, which makes it perfectly safe for kids, pets and wildlife. It is EPA exempt as a harmful substance, and should be applied during the morning hours when dew is present. Sprinkle the powder liberally onto the crabgrass to be killed, and in two to four days, the crabgrass will wither and die. It will also kill chickweed, clover, and basket grass, but may not be effective on other broadleaf weeds.
For the most economical broadleaf lawn weed killer, Southern AG 2,4-D Amine Weed Killer 32oz Quart Selective Broadleaf Weed Control 46.3% is your best bargain. It contains a whopping 46% of 2,4-D broadleaf weed killer, and that means you can use less and get the same effective results. It will control virtually all broadleaf weeds and many woody plants for full spectrum coverage, although it will not kill crabgrass. It's rain safe in 4 hours, and is applied with as a coarse spray.
If you want ease of use in a lawn weed killer, Spectracide Weed Stop Crabgrass Preventer and Broadleaf Weed Killer Granules are for you. The granules can be applied with a spreader, and they will kill over 200 types of broadleaf weeds. Although they won't kill growing crabgrass, if applied in the spring, it will kill crabgrass before it sprouts. Because it is a granule, it is not as effective as a spray, so multiple applications may have to be applied to achieve the same results.
The company has been in natural health and garden manufacturing for 35 years. Environmentally safe, organic, non-toxic, and pet approved, Burnout II is made of lemon juice, clove oil and vinegar as its primary ingredients. The product has been featured on garden shows and used at many botanical gardens across the country. Burnout works quickly to kill top growth within 24 hours, although a second application may be needed for deeply rooted weeds. This organic formula is safe to use around kids, pets and wildlife, and it won't pollute water sources.
This product is made of organic citrus oil that strips the waxy coating off of the plants and dehydrates them. It is an EPA registered product and is Organic Materials Review Institute, or OMRI rated, as well as USDA Organic-rated. The oil is environmentally friendly, biodegradable, non-toxic, and smells like citrus. It is safe around kids, pets and waterways, and is a spot weed killer that will kill any weed it is sprayed on. The bottle is designed so that you can also see where you are spraying as it is applied. Clove oil might make the #1 rated weed killer a bit more effective, but for all intents and purposes, Nature's Avenger could just as well be rated #1.
This is a non-toxic weed killer, that contains natural and organic clove and peanut oils as its main weed killing ingredients. It is classified as a minimum risk formula and does not have to be registered as a plant killing compound. What all that means is that EcoSMART Organic Weed and Grass Killer takes a slightly different path to kill weeds than the top rated formulas, but it does the job effectively and safely. Although it is safe to use around kids and pets, there is no confirmation that it is safe to use around areas with water like ponds, creeks or other waterways.
This is the most effective weed killer listed here, but it not as safe to use as the top 3 on this list. Bayer Advanced 706180A NATRIA Grass and Weed Killer uses relatively benign ammoniated soap of fatty acids, which is essentially the oil from plants mixed into an acidic formula. It replicates a clove oil/citric acid base but the chemicals used are not certified organic and they may not be totally natural. They are biodegradable, so they will break down in your soil, but they can't be used around waterways, and precautions must be taken to avoid breathing in the fumes while clothing and skin must be washed after use.
Vinegar is a natural weed killer that has worked for centuries, and it is just as good now as it was then. The vinegar must be of a higher acidic content than regular household vinegar, and for the most eco-conscious people out there, organic vinegar is available. The acid in vinegar will kill the plant effectively, but for deep rooted species, like dandelions, two or more applications may be required. Because this is a mild acid, don't breathe in the fumes, but in every other way it is non-toxic and can be used around kids and pets.