Organic Weed Controls

Lawn Care Service - Boulder and Fort Collins

If you see the term organic weed controls, or sometimes referred to as natural weed controls, this means that the end product is minimally processed and the ingredients come from natural sources like corn gluten meal, iron, or orange peel extracts. Organo-Lawn has been working with organic lawn care products since we opened for business in 1997. Today we are the leading organic lawn care company in the United States.

Organic Weed Controls for Lawns

Pre-Emergent Organic Weed Control for Lawns

Synergy with Corn Gluten Meal is derived from corn gluten meal and is an all natural pre-emergent weed control and fertilizer for use in lawns. Corn gluten meal prevents weed seeds from germinating properly and has been used as an organic weed control for lawns for more than 30 years.

Corn gluten meal needs to be applied at a very heavy application rate of 20 lbs per 1000 square feet. This is about 8 times heavier of an application than chemical fertilizers and about double the rate of an organic fertilizer. If applied correctly and before weed seeds germinate, Synergy will reduce weed germination rates by about 60% for the first use and up to 90%+ if used regularly for 3 or more years. If Synergy is applied both spring and fall for three or more consecutive years it is common to see up to a 95% reduction of weeds in a lawn.

Synergy is a proprietary product developed specifically for lawns in Colorado. Organo-Lawn has been using corn gluten meal for over 20 years and we use only the highest grade corn gluten meal. Synergy is an extremely effective organic weed control and organic fertilizer.

Post-Emergent Organic Weed Killer for Lawns

One Earth Weed Control is a incredible organic weed killer. It is derived from 100% natural ingredients and it will kill that majority of broadleaf weeds within 72 hours of an application. This all organic weed killer fast-acting, is one of the best dandelion killers available and it works just as well, if not better than chemicals.

This special organic weed killer kills weeds by overloading them with nutrients and the result is the weeds turn black and die. Depending on the type of weeds growing in the lawn, weed control rates are usually 60-90% per application. One Earth Weed Control contains no dangerous chemicals, it kills most broadleaf weeds fast, and the fertilizer in it will green-up the lawn quickly.

If the lawn is being watered according to the 1-2-3-2-1 lawn watering technique and the weeds are actively growing, we will see very high weed control rates. If the lawn is drought stressed or the weeds are mature then the weed control effectiveness will be reduced.

One Earth Weed Control is a proprietary product that is owned by Organo-Lawn. This incredible natural weed killer for lawns received a patent in 2018 and is truly a remarkable product.

Organic Weed Controls for Rock and Mulch Areas

Post-Emergent Organic Weed and Grass Control for Rocks

Avenger Weed Killer is an all-natural alternative to products that contain Glyphosate like Roundup.

Avenger weed and grass killer is derived from lemon and orange peel oil and it does a wonderful job at killing vegetation that is 4 inches or smaller. Avenger is the best non-selective organic weed killer that will kill small undesirable plants without harming the environment. The active ingredient in Avenger is d-limonene (citrus oil) and it works by striping away the waxy plant cuticle, causing the weed to dehydrate. Avenger weed control is as effective at killing plants as chemicals, but it only works on smaller weeds.

Compared to other organic herbicides like vinegar (acetic acid), citric acid, fatty acids, clove oil, or soaps, Avenger works better. Avenger is OMRI listed (Organic Materials Research Institute) and a wonderful organic option versus using chemical weed killers like Roundup.


To learn more about our organic weed control service please call our office at (303) 499-2000 Boulder or (970) 225-9425 Fort Collins.

Organic Weed Killer Louisville

FAQ - Organic Weed Controls

How does corn gluten meal kill weeds?

Corn gluten meal doesn't kill weeds, but it does prevent weed seeds from germinating properly. Corn gluten meal stops the development of a secondary feed root of the weed that is designed to uptake nutrients from the soil. Without the secondary feeder root the plant cannot develop from a young weed into an adult weed.

Organic Weed Control

Are organic weed controls safe for children and pets?

Organo-Lawn uses organic weed controls that are derived from food grade products and unless there is a concern of allergies they are considered to be non-toxic to people and pets. Fore example, corn gluten meal is a byproduct of the corn syrup production and is derived from corn. It is also found in many foods. Corn gluten meal is also used as a filler in dog foods and it is sometimes used in the making of beer.

Some organic weed control are dangerous to people and pets. For instance 20% vinegar is very corrosive, can cause permanent eye damage, and can burn skin. Organo-Lawn does not use these types of organic weed controls.

Note: The Colorado Department of Agriculture will not allow any weed control to be called or labeled as safe. Therefore, we cannot say that corn gluten meal is safe for kids and pets, but we can say it is made of edible ingredients that are non-toxic to people and pets.