Does Crabgrass Preventer Kill Dandelions?

Yes, crabgrass preventer can kill dandelions. Crabgrass preventer can kill dandelions before they even appear in your lawn if you apply it at the right time.

Dandelions are pesky weeds that can quickly take over your lawn if not properly managed. Crabgrass preventer is commonly used to prevent the growth of crabgrass in lawns, but many people wonder if it can also eliminate dandelions. The answer is yes, crabgrass preventer can kill dandelions if applied at the appropriate time. When crabgrass preventer is applied before the germination of weed seeds, it can prevent both crabgrass and dandelions from growing. However, once the dandelions have already emerged, crabgrass preventer may not be as effective. Therefore, timely application is crucial for effective weed management. Use of cultural controls, such as regular mowing and proper fertilizer application, can also help keep dandelions in check.

Does Crabgrass Preventer Kill Dandelions?


Overview Of Crabgrass Preventer And Its Effectiveness

Crabgrass preventer is a herbicide that helps control the growth of grassy annual weeds like crabgrass. Its chemical composition targets the weed’s germinating seeds in the soil, ensuring they don’t grow. While it’s mainly formulated for grassy weeds, the herbicide can also manage broadleaf weeds like dandelions.

However, it’s not designed specifically for these types of weeds, and its effectiveness may vary. To ensure that crabgrass preventer effectively controls dandelions, it’s important to apply it before the weeds emerge. Overall, crabgrass preventer has proven to be an effective solution for preventing weeds in lawns, gardens, and other outdoor spaces.

Understanding Dandelions

Dandelions are a common weed that grow in lawns and gardens. Their life cycle starts with a yellow flower that turns into a fluffy white seed head. There are two main types of dandelions, taraxacum officinale and taraxacum erythrospermum. Identification can be tricky, but they typically have a rosette of leaves and a single hollow stem.

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Many factors can contribute to dandelion growth, including soil conditions, nutrition, and weather. Crabgrass preventer may prevent dandelion seeds from germinating, but it will not kill existing plants. Understanding the basics of dandelions can help you identify and control them in your lawn or garden.

How to get rid of CRABGRASS and DANDELIONS || Apply Pre-Emergents in Spring!

How Crabgrass Preventer Affects Dandelions

Crabgrass preventer affects dandelions differently than other weeds since dandelions are perennials. Timing and application rates impact the effectiveness of crabgrass preventer on dandelions. It’s essential to use the right crabgrass preventer formulation to control dandelions effectively. Pre-emergent crabgrass preventers are best for stopping dandelions from germinating.

Post-emergent crabgrass preventers are ideal for targeting dandelions that have already grown. Using a combination of both formulations is the most effective way to control dandelions. Therefore, it is essential to determine the type of crabgrass preventer formulation and use it correctly to yield effective results in controlling dandelions.

Alternatives To Crabgrass Preventer For Dandelion Control

Crabgrass preventer does not always kill dandelions. Here are some lesser-known alternatives to control dandelions without chemicals. Comparing the pros and cons of each method can help you choose what suits you best. Solarization is an effective method to reduce weed growth, especially in summer.

Hand weeding works well for a small infestation and should be done before they seed. Mulching or covering the soil with newspaper or cardboard suffocates weeds and prevents their growth. Overall, non-chemical methods can be a better long-term solution and create a more sustainable lawn.

Keep in mind that every method has its own benefits and drawbacks, and various factors, such as the size of the lawn, soil type, and weather impact the efficacy of each.


As we come to the end of this blog post, we hope that we have shed some much-needed light on the question of whether crabgrass preventer kills dandelions. Our research has shown that while crabgrass preventer may be effective in controlling the growth of crabgrass, it can only go so far when it comes to getting rid of dandelions.

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Depending on what kind of crabgrass preventer you are using, it may or may not have any effect on dandelions at all. Only products that contain specific ingredients like quinclorac or sulfentrazone have a chance of being effective against dandelions.

It is also important to note that even if a crabgrass preventer does kill dandelions, it may not be the best approach to take, as other methods may be more effective or environmentally friendly. Careful consideration and research is always necessary when it comes to making decisions about lawn care.