What are the Weeds with Purple Flowers called?

What are Weeds? What are the different types of Weeds with Purple Flowers? What do Hog Weed, Crabgrass, Milkweed, and Knot Weed look like?
what are the weeds with purple flowers called

Weeds and gardeners are sorts of lifetime enemies. But some weeds have beautiful flowers that are often confused with plants. Today you will get to know about what are the weeds with purple flowers called. In addition, you will get an idea about what does hogweed look like, what does crabgrass look like, what does milk weed look like and what does knotweed look like. 

1. What are Weeds?

what are the weeds with purple flowers called 1

Undesirable plants growing in the wrong place without being planted are known as weeds. For example, small grass-like leaves grow in the cracks of sidewalks, in gardens, parks, and lawns. These plants are unwanted because they self-grow and steal the nutrition of the plants beside which they are growing. If you are wondering, what are the weeds with purple flowers called, go through the next segments where all the types are discussed in detail. (See How to Make a Sunflower Garden?)

2. What are the Weeds with Purple flowers called?

Flowers growing with weeds are sometimes beautiful enough to convince you to keep them. Take a look at the names of purple flower weeds.

  • Black Nightshade,
  • Creeping Charlie (Ground Ivy), Creeping Thistle (Canada Thistle),
  • Dove’s Foot Crane’s Bill, Forget Me Not,
  • Henbit, Musk Thistle (Nodding Thistle), Purple Deadnettle,
  • Selfheal (Healall), Spear Thistle (Common or Bull Thistle), and
  • Wild Violets. (See 18 Purple Flowering Shrubs For Your Garden)

3. What is a Black Nightshade (Solanum nigrum)?

black nightshade: what are the weeds with purple flowers called 3

This weed can be tall and leafy. You can identify them by their purple-white flowers or from their red-purple berries. They are either like climbing plants or bushy. This weed is considered a summer annual which means it dies naturally as the air gets chilled. That is the time when its stem starts turning purple. Every part of it is toxic and it is easier to pull them by hand to control their growth. (See Where Do Black Olives Come From?)

4. What does Creeping Charlie (Glechoma hederacea) look like?

This weed is also known as Ground Ivy and is a relative of the mint family. They grow fast and cover the entire lawn surface. You can identify them by their purple flowers that have four-lobe heads which bloom during late spring to early summer. Removing them is hard as they dodge even the lawnmower, pests, and diseases. It is best to remove them during summer while they are dormant. Must read about the types of Ivy Plants and facts.

5. What is a Creeping Thistle (Cirsium arvense)?

Creeping Thistle

While discussing what are the weeds with purple flowers called, you must note that creeping thistles are the ones that grow best in low fertile soil. These perennial weeds have spear-shaped leaves, sharp spines, and purple flowers that look like pom-pom. During their fertilization stage, they look like dandelions. These weeds have a deep root system that makes them hard to remove. However, you can regularly mow the lawn and increase the soil fertility to stop its growth. Also, check out why do People wish on Dandelions?

6. What is Dove’s Foot Crane’s Bill (Geranium molle)?

This weed is considered less harmful by some gardeners because of its purple flowers. You can identify them by their purple-colored jagged, round, and little hairy petals. Each flower has 5 to 7 leaves, but despite their beauty, they are a problem. They prefer dry and arid soil, so keep the soil moist to control their growth. (See What are the Desert Cactus Types?)

7. What is Forget Me Not (Myosotis sylvatica)?

Forget me not

These are commonly grown as border plants but they are actually weeds. They have yellow-centered five-petal flowers, mostly in light blue and purple shades. Gardeners prefer to keep them because they are easy to take care of, but they can also get out of control and harm other plants. Also, check out what are the Uses of Soil?

8. What does Henbit (Lamium amplexicaule) look like?


This weed mostly grows in moist areas like near ponds. Seeds from the flowers of henbit are loved by hens and turtles, which is why it got this name. They are often confused with deadnettle due to their appearances. Things that make Henbit different from deadnettle are as follows which will give you a better understanding of why and what are the weeds with purple flowers called.

9. What is Musk Thistle (Carduus nutans) weed?

These are 15 inches long barbs with wavy-edged leaves, spiny winged stems, and purple-pinkish flowers. The flower heads droop down like in a nod, giving this weed its name. These weeds sometimes reach up to a height of 6 feet (72 inches) with 2 to 3 inches (5 to 7 cm) flower heads. (Also read How Does Cactus Grow in Desert?)

10. What does Purple Deadnettle (Lamium purpureum) look like?

Purple Deadnettle

It is an annual, fast-growing weed that grows from mid-spring till summer. You can identify them by their square-shaped stem, triangular leaves, and grouped four petals, tubular-shaped flowers in purple, pink, or white colors. Mostly the tips of flower petals are colored. It is a natural bee and pollinator attractor but highly resistant to other factors to remove them. (See How to Grow a Purple Leaf Plum Tree?)

11. What is Selfheal (Prunella vulgaris) weed?

This weed belongs to the mint family and has oval leaves. You can identify them during their immature stage when the stems are hairy. It is not very tall with purple flowers having two purple leaves beneath them. You can remove them by hand pulling them. Must read what does Mulch do?

12. What is Spear Thistle (Cirsium vulgare) weed?

Spear Thistle

The unique features of the weed family can make you understand what are the weeds with purple flowers called as this type can be identified by their spiny balls with pink or purple flowers on top of them. The flowering season is from June to October, but it is better to uproot them before flowers bloom to control their spread. (See Why Do Potatoes Sprout?)

13. What are Wild Violets (Viola Odorata)?

This weed uses underground rhizomes to propagate fast, which can be hard to control. The rhizomes are thick and strong. You can identify them by their purple heart-shaped flowers with a tiny yellow center. However, the flowers can also be blue, white, or yellow. (Also read Types of Trees with Purple Flowers)

14. What does Hogweed look like?


Hogweed (Heracleum mantegazzianum) belongs to the Apiaceae family and thus has the appearance of giant cow parsley. It grows up to a height of 1 m to 2 m (39 inches to 78 inches). The stems are green with purple blotches and stiff-white hairs. It has huge leaves 1.5 m (59 inches) long and 3 m (118 inches) in length. Leaves have jagged edges and are also hairy at the bottom. Flowers are clustered on umbrella-like heads in white or pink colors. (See What is a Toadstool?)

15. What does Crabgrass look like?

Crabgrass (Digitaria) looks like a light green clump of grass on land. The blades are thick like a pencil until they reach their immature stage, after that you can notice a star-shaped pattern in the middle. Hairy and Smooth crabgrasses are the two varieties and both are summer annuals. The hairy grows up to 3.5 feet (42 inches) long while the smooth grow only 2.5 feet (30 inches) long. (Also read How to Grow Purple Sunflowers?)

16. What does Milk Weed look like?

Milkweed flowering

Besides what are the weeds with purple flowers called, there are more subparts of milkweed, namely butterfly, common, showy, and swamp milkweed.

  • Butterfly (Asclepias tuberose) is 1 m or small with hairy stems and narrow, oval, and tapered leaves that are 5 to 12 cm long and 2 to 3 cm wide. They have large clusters of bright orange flowers. 
  • Common milkweed (Asclepias syriaca) is 2.5 m (98 inches) tall with wide-oval 25 cm long leaves which are smooth on top and velvety underside. It has no branches but 10 cm clusters are filled with purple-pink, pleasant-smelling flowers.
  • Showy (Asclepias speciosa) is 1.75 m high with taper leaves in gray-green colors. The star-shaped purple-pink flowers are located in large loose clusters.
  • Swamp (Asclepias incarnate) is 1.5 m high with branches. Leaves taper to a sharp point being 15 cm long and 1 to 4 cm wide, but these dimensions may vary. Milky white sap is released on breaking stems or leaves. Light pink, white, or purple flowers grow in clusters on the top of the plant. Must read what do Botanists do?

17. What does Knotweed look like?

Japanese knotweed

Popularly, known as Japanese knotweed (Reynoutria japonica) is 2 m to 3 m high with heart-shaped green leaves. It has bamboo-like stems with purple or dark-red speckles with white-creamy flowers in clusters. Its rhizomes have a tinge of orange when cut. (See What is the Most Expensive Truffle?)

Hope you understood what does hogweed look like, what does crabgrass look like, what does milk weed look like, and what does knotweed look like. It is time to share what are the weeds with purple flowers called with your friends and family. (Also read  Why Make a Wish Bouquet?)

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