19 Blue Weeds: Identify and Eliminate the Most Common Ones

Blue weeds are common wild plants that are responsible for the invasion of an area in which they do not belong. They might offer some benefits, but they have the potential to multiply rapidly and overtake your territory.

In this complete guide, we will talk about blue weeds, the several ways that it can be identified, and the different ways that it may be controlled.

If you want to learn more about these weeds that have a habit of popping up in your garden, continue reading. 

Complete List of Blue Weeds

1. Squill Siberia 

The Siberian Squill, also known as scilla siberica, is a very small weed that develops very slowly and begins to produce flowers relatively early on in the spring. This weed with blue blooms on the grass grows fairly strong despite the fact that it does not get very tall at all. 

Blue lawn weeds is wild plants in your lawn with tiny blue blossoms, which makes them difficult to spot at first. These weeds, even though their flowers are pretty small, are invasive plants that compete with turf grass and should be eliminated through the use of either chemicals or through mechanical means.

Most of these weeds pose no threat to human health, but some can be pretty hazardous. It is necessary to learn how to get rid of blue flowers on the lawn to avoid taking any chances.

– Weed Description

The leaves of this plant are shaped like swords and grow in a manner that is reminiscent of grass blades and they emerge from the bottom of the plant and thrive in an upward direction.

Because of this growth habit, the blue blossoms stay low on the turf grass, which allows them to spread in patches. This blue wildflower is harmful to all mammals, including humans, dogs, and cats. 

– How To Get Rid of It

This plant is tough to get rid of because it can produce its seeds and spread through bulbs. You can dig it up and take it out by the roots if you get there early enough and capture it when it’s still young.

In situations where the contamination is extensive, it may be advantageous to use black plastic, layers of cardboard, or any other strategy to cut off its vital growth elements.

2. Common Blue Violet 

Common Blue Violet or the Viola sororia is characterized by its clusters of tiny flowers that can quickly spread across fields and take over your turf.

After it has germinated, it has the potential to spread via seeds and rhizomes. These plants multiply extremely fast, so it is important to get rid of them as soon as you see them sprouting in your lawn.

– Weed Description

The Blue Violet becomes yellow and withers away as the weather gets hotter in the summer, but it has a rapid growth spurt in the spring when it is cool and damp outside. It leaves unsightly patches on grass that is otherwise neatly maintained.

The maximum height of this attractive-appearing plant is only about six inches and the leaves and flowers grow upward from the base of the plant, although the flowers themselves are only as tall as the top leaves. 

– How To Get Rid of It

Under conditions of low temperatures, high humidity, and partial shade, these weeds multiply fast. Mowing the grass frequently is the most effective method for preventing the spread of this particular species of weed and hand plucking works when the outbreak is not particularly strong.

If there is already a significant infestation, you can identify the weeds and treat them with an herbicide that is effective against broadleaf plants.

3. Tiny Bluets 

Tiny Bluets or Houstonia pusilla enjoy covering the ground, staying low and near to the ground, and blending in with low-cut turf because of this behavior. Tiny bluets continue to be active all throughout the chillier months of winter and begin to blossom in the early stages of spring with stalks and leaves. 

– Weed Description

Due to the striking similarity in appearance, it is simple to think that it is a teeny-tiny grass weed instead of what it actually is.

It possesses a body structure that is extremely minute and it isn’t until the middle of spring that the seed pods and blooms begin to open up and show their full beauty.

– How To Get Rid of It

Tiny Bluets have delicate taproots that are extremely sensitive but simple to uproot. You should pull away any weeds in the early spring before the plants produce seeds, because by then, it will be very difficult to remove.

4. Asiatic Dayflower 

Asiatic Dayflower or commelina communis is a naturally occurring weed in South Asia and moves at a high rate and covers the yard in a short amount of time.

It reproduces through seed and also has the ability to form roots at the nodes on the leaves when grown on moist ground, which makes the process of eradicating these plants and their colonies much more difficult.

– Weed Description

The Asiatic Dayflower is a noxious weed with a few blooms that are pure blue in color, in contrast to the others which are either purple or violet. It could reach heights of up to three feet, either standing upright or sprawling across the ground as it matures. 

– How To Get Rid of It

It is not the simplest to eliminate, so if it is just beginning to develop on your lawn, you can remove it by hand by pulling it and destroying it. In the event that there is a significant infestation, an herbicide is going to be necessary. You won’t be able to kill this plant using glyphosate, so you’ll need to switch to a pesticide based on flumioxazin instead.

5. Henbit 

Henbit or lamium amplexicaule is a low-growing shrub that can withstand freezing temperatures and produces tiny blue flowers, though it is possible that it will begin to develop if there is a warmer spot during the winters.

Early in the spring, henbit begins to bloom and produce seeds, and then it withers and dies as the temperature rises. It will leave bare spots on your grass bed, but the grass will grow thicker the following growing season.

– Weed Description

This low-growing plant has square leaves and stems that are greenish-purple, spread out flat on the ground, and has egg-shaped leaves on opposite sides, making it difficult to locate.

– How To Get Rid of It

To stop the henbit plant from reproducing and dispersing its seeds, pull it out by hand as soon as its blue flowers show in the early spring.

You can also use a post-emergent herbicide to address areas that have been infested. Maintaining a thick lawn and avoiding over-watering it when spring arrives are the two things you can do to protect your property from henbit.

6. Carpetweed 

Carpetweed or the ajuga pyramidalis is a grass plant with delicate blue flowers that has the potential to quickly take over an entire yard. It’s a type of ground cover that doesn’t stop growing, even over the winter, and if you let it be for more than a year, it can get pretty well-rooted.

– Weed Description

It is capable of suffocating turf and spreads via rhizomes. With its green leaves that are oval in shape, it can grow to a height of around six inches. Flower spikes in inflorescence appear from May through June when it is in full bloom.

This flower has alternate leaflets that are a vibrant red and purple color and hold tiny blue blossoms. This grass weed with blue blossoms should be eradicated as soon as possible.

– How To Get Rid of It

During its first growing season, you should be able to pull it up by hand; after that, it will quickly lose its foothold and uproot itself on its own.

If you did not see it in time and it has since grown, the weed in your yard will need to have its entire root dug out and removed in order for you to be able to get rid of it.

7. Oxalis Blue

Blue Oxalis or Parochetus communis grows when a lawn has been neglected or is under a lot of stress. It has a low profile and can often be discovered concealed in the grass or among white clover before it blooms.

This plant may quickly spread from one location to another, and each seed pod can contain hundreds of seeds that burst open the moment they are touched and immediately cover the surrounding area.

– Weed Description

Oxalis Blue bears a striking resemblance to certain species of sorrel and clovers due to the fact that its leaves are trifoliate and it can reach a height of between four and eight inches. They produce a pea blossom that is a brilliant shade of blue and blooms from summer into October.

– How To Get Rid of It

This plant, which is another common lawn weed that has blue flowers, may be easily removed by hand and should be done so early in the spring before it blooms.

For successful manual removal, the entire root must be pulled out; otherwise, the organism will continue to reproduce. By cutting the grass high, watering frequently, and fertilizing thoroughly, it is possible to prevent the growth of blue oxalis.

8. Columbine Aquilegia

Columbine Aquilegia or Aquilegia vulgaris is a weed that might show up on your turf and it is blue. It starts producing its seeds in late spring or early summer and blooms heavily all throughout that time.

Because the seeds germinate in conditions that are analogous to those of healthy grass, the subsequent spring will witness an even more severe infestation.

When pulling out these weeds, exercise extreme caution because the sap from the plants could cause skin irritation. It is recommended to wear heavy-duty gloves when trying to remove these weeds.

– Weed Description

It possesses long leaves that are lacy and light green, and it has a sturdy stem composed of numerous long, slender branches that grow in an upward direction. At the tip of every branch is a bud that develops into a bell-shaped flower that opens to reveal bluish-purple petals.

– How To Get Rid of It

You can manually pull out any blue-blooming weeds in your lawn if there are only a few of them; keep their numbers low, and they won’t be able to reproduce or spread their seeds. Otherwise, it is recommended to cut the tops of the plants before they produce seeds if the area being worked on is large enough.

9. Creeping Bellflower 

The Creeping Bellflower or Campanula rapunculoides is a blue lawn weed that spreads quickly and reproduces both by seeds and rhizomes. Because it has horizontal stem rhizomes as well as deep taproot tubers, it is extremely challenging to eradicate. 

– Weed Description

The stem of the Creeping Bellflower is greenish-purple in color and can grow up to a height of three feet.

The leaves have a form similar to a heart and are a vibrant green color and are approximately four inches long. The flowers have a bell-like appearance with five lobes that bloom from June all the way through to October.

– How To Get Rid of It

these species must be exterminated as quickly as possible because of how invasive it is. Take note that mowing and trimming back a mature plant could make it weaker, but it won’t destroy it; thus, in order to eradicate this grass weed, you need herbicides that include either glyphosate or dicamba.

Dig down at least twelve centimeters from the top and remove all tubers and rhizomes from the plant to completely eradicate it.

10. Bush Vetch

Bush Vetch is indigenous to both Asia and Europe. The height of these weeds, which have tiny blue flowers, can reach up to six feet, so it is important to eradicate these weeds before they reach maturity if you so wish.

– Weed Description

It possesses pinnate leaves that are oval in shape and have rounded margins and in most cases, you will find Bush vetch growing in various wooded areas and along hedgerows.

Since bush vetch improves the quality of the soil by adding nitrogen to it, you may want to avoid disturbing it if your soil is in poor condition and instead allow it to do its job. 

– How To Get Rid of It

It is possible to use it as green manure, which means that after it has grown, it can be plowed under in order to help enrich the soil. Before it produces seeds, bush vetch can be removed from your lawn by pulling it up by hand, hoeing it, or mowing it over with a lawn mower.

11. Blue or Purple Chicory

The blossoms of chicory, which are more commonly known as weeds, have gained notoriety in the culinary world. According to the comprehensive Ohio Weedguide, chicory was a salad crop that was once very popular in the United States but lost its favor in the early 1700s. 

– Weed Description

It is challenging to get rid of chicory weeds because of their exceptionally long taproot. They can obtain moisture even under conditions that prevent other plants from doing so.

The height of the plant can range anywhere from one to three meters (three to five feet). Its leaves have an appearance that is comparable to that of dandelion leaves. 

– How To Get Rid of It

Where some gardeners think they have a nice appearance, on the other hand, they are considered by many gardeners to be an invasive weed that is harmful to adjacent plants.

Mowing chicory can help keep it under control and reduce spreading. To get rid of it, however, you can spot-treat it with an organic weed killer and then reseed the area with grass.

12. Creeping Charlie

Creeping Charlie or Glechoma hederacea is a type of ground ivy that can have either blue or purple blossoms. 

– Weed Description

It has brilliant green leaves that are scalloped on the edges and grow in close proximity to the ground.

The flowering period ranges from early spring to late spring, and the stems are square. Other plants tend to be smothered by the Creeping Charlie. 

– How To Get Rid of It

You can get rid of it by removing branches that are blocking the sunshine and enhancing the drainage in the soil. Keeping up with your regular mowing also helps. In the event that creeping Charlie has already taken root in your lawn, you will most likely require the use of an organic herbicide in order to eliminate it.

13. Forget-me-not Flower

The forget-me-not flower, or Myosotis scorpioides, has a regal appearance and is a weed with dainty blue flowers.

– Weed Description

The blue-colored flowers come with five petals and a yellow center and grow in wet, shaded regions with good soil.

They are of a modest size and while the flowers are most commonly known for their violet coloration, their petals can also be pink, yellow, white, blue, or even violet. They can reach a height of up to 45 centimeters and have leaves that resemble lances. 

– How To Get Rid of It

Digging up the entire plant is the most effective method for getting rid of forget-me-nots in your yard or garden — roots and everything! Covering the area with mulch is yet another method. It is possible that you will want an organic weed killer to deal with huge infestations.

14. Germander Speedwell 

Germander Speedwell Blue or Veronica chamaedrys are flowering weeds of lawns that can be found growing in woodlands, meadows, and along roadsides. It can also spread through the roots and the seeds of the plant. It is capable of forming a dense mat that can suffocate other types of plants.  

– Weed Description

This is a compact weed that grows close to the ground and bears flowers that can be either blue or violet. Each flower has four individual petals that are evenly spaced around the core of the flower.

However, the petal that is located at the bottom of the flower is much smaller than the other three. The flowers have lighter blue veins that are surrounded by a deeper blue. It’s possible that you’re thinking about how to get rid of the speedwells in your yard. 

– How To Get Rid of It

If you simply have a few speedwell plants that need to be removed, you should consider using the removal method of hand-pulling. In the event that you have more, you may try mulching the entire patch or covering it with many layers of newspaper. 

15. Slender Speedwell

The natural range of the slender speedwell includes both Asia and Europe. It thrives in warm, sunny climates and can be found in several different forms.

– Weed Description

The leaves of the slender speedwell are long and narrow, and they are clustered in pairs. They have a deep emerald hue, and if you look at them carefully, you can see that they are sparkling. It is a remarkably delicate plant, but despite its fragility, it is remarkably hardy.

You may anticipate the tiny blue flowers to blossom sometime in the early summer and the average height of a slender speedwell plant is about eight inches.

– How To Get Rid of It

Gardeners often cut this weed off their lawns and use it as a ground cover instead. However, it has the potential to take control and spread to unintended places. Pulling it up by the roots is the best way to get rid of thin speedwell. Try applying an organic herbicide instead, just in case that doesn’t work.

16. Corn Speedwell

Corn speedwell or Veronica arvensis is a type of weed that grows annually during the winter and has tiny, vivid blue blooms. It grows best in sunny regions with poor soils that range from damp to dry and thrives in areas that have been disturbed. 

– Weed Description

The wind disperses the seeds of this plant particularly in the early spring and late fall when those seasons are at their peak.

The mature plant can grow to a height of around 12 inches and a width of the same measurement. If you let it flower, the seeds will spread across the grass, and by the following spring, you will have weeds everywhere. 

– How To Get Rid of It

Increased turf density achieved through nitrogen fertilizer and consistent mowing are all effective ways to cut down on the prevalence of corn speedwell. Using a combination of pre-emergence and post-emergence herbicides, it is possible to eradicate or at least manage this weed.

17. Blue-Eyed Grass

Blue-Eyed Grass or Zea mays or Sisyrinchium angustifolium is an appealing weed where blue flowers blossom in the spring season and continue throughout the summer months. The fields, glades, and open woodlands of eastern North America are the natural habitat of white, blue-eyed grass. 

– Weed Description

When it is grown in the middle of a well-maintained lawn, the plant stands out like a sore thumb due to its height of 20 inches. It can survive periods of drought, can survive winters in zones 4 to 9, and will come back to life in the spring.

The blooms bloom from early spring to the middle of spring on flower stems that are unbranched and often have two clusters of flowers on each stem. The flowers range from white to pale blue and have yellow eyes.

– How To Get Rid of It

Because blue-eyed grass has a relatively short lifespan for a perennial plant but can quickly establish itself from seeds, maintaining a regular mowing schedule can help weed control its spread.

When you mow your lawn, you should never remove more than one-third of the grass blades at a time; otherwise, the growth of your turfgrass may become stunted and thin.

18. White Clover 

This is a perennial weed with broad leaves; although it isn’t blue, but it bears a striking resemblance to oxalis blue. It can be found in lawns, gardens, and other landscaped areas that receive full sun to moderate shade.

– Weed Description

The height of the weed is between eight and ten inches, and the width is 12 inches. White clover can be identified by its appearance, which consists of leaves with three lobes and circular clusters of white flowers. The plants immediately multiply and form dense mats of foliage as they extend outward.

– How To Get Rid of It

White clover can be prevented from appearing in landscaped areas if you mulch your garden beds. To get rid of clover that is growing in lawns, use a herbicide that contains iron, or dig out the weeds that are growing in garden beds.

Some gardeners use clover to make their lawns more environmentally friendly since the plant supplies nitrogen to the soil and its blossoms provide food for a large number of different kinds of pollinators.

19. Blue Alkanet

The Blue alkanet is a perennial plant that grows wild in the moist and shady areas of southwest Europe. Bees and bumblebees are responsible for pollinating these brilliant blue flowers.

– Weed Description

Boraginaceae, the family that includes forget-me-nots, also includes borage and comfrey, and blue alkanet is a member of this family. Stems reach up to 80 centimeters (32 inches), and the leaves are oval and visibly bristly.

Flowers of a forget-me-not kind that are bright blue with a white center and are 8-10mm (1/2 in) in diameter open from pink buds. These buds are produced from April to June.

– How To Get Rid of It

It is important to get rid of these weeds as soon as you can given how quickly they might spread. Consider first whether this can be achieved, such as by digging it out or covering it with mulch; if it can’t, then resort to using chemicals.

In addition, you may make use of garden compost and manure, chipped bark, gravel, grit, or slate chippings, or you could combine gravel and grit.

Conclusion

You went through a complete list of blue weeds that might spread all over your lawn in this post, along with some fast inputs on how to get rid of them.

This article also included other vital information and what follows below is a summary of everything that you have read.

• Only a select few invasive plant species call for more care and attention. The invasive plants in your yard not only make it appear like a mess, but they also have the ability to suffocate the garden plants that you have worked so hard to grow.
• There are primarily four ways that may be utilized to get rid of invasive plants on your lawn that do not entail the use of potentially hazardous chemical herbicides. 
• To get rid of weeds, you can either take them out by hand, keep them concealed, or suffocate them by covering them with mulch or mowing them down. 
• It is possible that they will not grow back as a result of this, although this does depend on the species. It’s also possible that it just hides them and makes them less noticeable.
• Here are some examples of the most frequently-seen blue weeds: blue oxalis, columbine aquilegia, common blue, blue violet, common blue violet, creeping bellflower, siberian squill, tiny bluets, lawn weeds, asiatic dayflower, creeping Charlie, white clover, wild violet, and wild violet.

It is possible for you to achieve your goal of having a neat and tidy grass area now that you know how to get rid of the undesirable blue weeds in your garden.

Get your tools ready because you need to nip this problem in the bud before it becomes an even bigger issue.