How to Grow Chocolate Cosmos

Looking for a dark, chocolaty flower for your garden? Look no further than chocolate cosmos! This stunning flower has velvety, rounded petals in rich maroon shades, with dark brown centers.

Their chocolaty scent is sure to whet the appetite of any gardener. Chocolate cosmos flowers are about an inch and a half across, similar in size to regular cosmos flowers.

They look great with all shades of pink flowers, creamy white flowers, and blue shades to balance out the brown tones.

Botanical Name Cosmos atrosanguineus
Common Name Chocolate Cosmos
Plant Type Annual, perennial above Zone 7
Mature Size 30 in. tall
Sun Exposure Full sun
Soil Type Rich, well drained
Soil pH Slightly acidic
Bloom Time Summer
Flower Color Dark red
Hardiness Zones 7-11 (USDA)
Native Areas Mexico

Tips for Keeping Your Plants Healthy:

  • Chocolate cosmos are not frost-tolerant, so make sure to plant them after the last frost date in your area.
  • They prefer full sun but will tolerate partial shade.
  • Water regularly, especially during hot weather, to keep the soil moist but not soggy.
  • Fertilize monthly with a balanced fertilizer such as 20-20-20.
  • Pinch back the stems of young plants to encourage bushier growth.

If you’re looking for a dark and dramatic flower for your garden, chocolate cosmos is a great choice. This Mexican native has rich maroon blooms with chocolaty scent that will tantalize your senses. Chocolate cosmos are easy to grow and make great cut flowers.

Lighting and Temperature

Chocolate cosmos grow best in full sun but will tolerate partial shade. They’re not frost-tolerant, so make sure to plant them after the last frost date in your area.


Chocolate cosmos grow best in rich, well-drained soil that’s a bit acidic. They’re not picky about soil type as long as it drains well. Transplant chocolate cosmos in early spring before new growth appears.


Fertilize chocolate cosmos monthly with a balanced fertilizer such as 20-20-20.


Pinch back the stems of young plants to encourage bushier growth. Cut back chocolate cosmos after they bloom to encourage reblooming.

Division and Transplanting

Chocolate cosmos can be divided in early spring when new growth appears. They can also be transplanted at this time.

Transplant chocolate cosmos in early spring before new growth appears. Choose a location with full sun and well-drained soil. Space plants 18 to 24 inches apart. After planting, water well and mulch around the base of the plant to help retain moisture.

How to Grow Chocolate Cosmos from Tubers:

Chocolate cosmos are best started from tubers in late winter or early spring, about six weeks before the last frost date in your area.

Start by soaking the tubers in water for a few hours before planting. This will help them to sprout more quickly.


Water regularly, especially during hot weather, to keep the soil moist but not soggy. Mulch around the base of the plant to help retain moisture.


Chocolate cosmos grow to be about 30 inches tall.


Chocolate cosmos bloom in summer.

Common Pests and Diseases

Any gardener knows that there are a multitude of pests and diseases that can wreak havoc on their plants. However, few people realize that these same problems can also affect the quality of their chocolate.

Powdery mildew, stem canker, Rhizoctonia stem decay, gray mold, and Aphids are all common problems in cocoa plantations, and all of them can end up in your chocolate bar.

To avoid powdery mildew, give your plants plenty of space and allow them to breathe. Stem canker can be controlled by pruning infected branches and Destroy all plant debris.

Rhizoctonia stem decay can be prevented by ensuring that the soil is not too wet.

Gray mold can be controlled by spraying the plants with a fungicide. Finally, Aphids can be kept at bay by planting garlic or marigolds among the cocoa trees.

By taking these steps, you can enjoy your chocolate without worrying about the harmful organisms that may be lurking inside.


Chocolate cosmos (Cosmos atrosanguineus) is a species of Cosmos, native to Mexico. It is a perennial plant growing to 0.6 m (2 ft) tall and wide, with deeply chocolate-scented maroon or almost black flowers borne in summer and autumn on top of slender stems bearing mid-green leaves.

The specific epithet atrosanguineus refers to the dark color of the flowers. Chocolate cosmos is not actually a true cosmos; it was formerly classified as a member of the related genus Valvanthes, but differs from members of that genus in a number of ways.

It is now the only member of the monotypic genus Cosmea.

The plant prefers full sun and well-drained soil, though it will tolerate partial shade. In cold winter climates it is best grown as an annual, dug up in autumn after the first frost and replanted in spring.

In warmer climates where it grows as a perennial, it may be necessary to provide some protection for the roots during winter, either by re-potting and bringing indoors, or by covering with natural mulch such as straw or bark chips.

The flowers are excellent for cutting and make a beautiful addition to any garden.

Propagating Chocolate Cosmos

Propagate Chocolate cosmos plants from seed. The seeds are sterile, so they will not reseed or produce plants from seed. These flowers can only be propagated by root cuttings or planting.

The roots are thick and tuberous; for the most successful plant starts, look for root sections with “eyes” or buds of new growth. Start by preparing the planting area.

Choose a location that receives full sun and has well-drained soil. Dig a hole that is twice the width and depth of the root cutting.

Carefully remove the root cutting from the main plant, being sure to include any buds or eyes in the cut section. Plant the cutting in the prepared hole, and then water it thoroughly. Keep the soil moist, but not waterlogged, until new growth appears.

Once the plant is established, it will need to be watered deeply once a week during dry periods. With just a little care, you can propagate Chocolate cosmos plants from root cuttings and enjoy their fragrant blooms for years to come.

Do cosmos flowers come back?

Cosmos are one of the most beautiful, easy to grow flowers that bloom abundantly all summer until the first killing frost in fall. They come in a wide variety of colors including shades of pink, purple, red, orange, and white and their delicate blooms resemble daisies.

One of the best things about cosmos is that they self-seed readily, which means you can enjoy them for years to come with very little effort.

If you allow some of your cosmos flowers to go to seed at the end of the growing season, they will likely come back the following year. However, it’s important to note that most cosmos varieties available today are hybrids, which means they may not always come back true to form.

Nevertheless, cosmos are still an excellent choice for adding color and interest to your garden with very little work required on your part.

What month do chocolate cosmos bloom?

Chocolate cosmos flowers are one of the most beautiful and fragrant flowers you will ever encounter. They have a deep chocolate color and emit a sweet, intoxicating smell that is sure to please anyone who catches a whiff.

These stunning blooms grow from tender tubers and can be cultivated as annuals or brought indoors to winterize in cold climates.

Chocolate cosmos can reach up to 30 inches in height and thrive in a sunny area of the garden. The flowers bloom from midsummer until autumn and are incredibly easy to maintain, making them the perfect addition to any gardener’s repertoire.

If you’re looking for a flower that is sure to turn heads, look no further than the chocolate cosmos.

What is the season of cosmos flower?

The season of the cosmos flower is summer. This is the time when the plant blooms and produces its pretty flowers. The plant grows best in warm weather, so summer is the ideal time to plant it.

Cosmos flowers come in a variety of colors, including white, pink, purple, and red. They make a great addition to any garden, and they’re also popular cut flowers.

If you’re looking to add a splash of color to your garden this summer, be sure to consider planting some cosmos flowers.

How do you take care of chocolate cosmos?

Chocolate cosmos plants are a beautiful and fragrant addition to any garden, but they can be tricky to care for. Here are some tips on how to keep your chocolate cosmos plants healthy and happy. First, chocolate cosmos prefer fertile soil that is well-drained.

They also need full sun for six hours of sunshine a day. Too much water can make the plant’s roots turn brown and rot, so it’s important to water them deeply once a week. Second, chocolate cosmos are heavy feeders and need regular fertilization.

A general-purpose fertilizer applied every two weeks should suffice. Finally, chocolate cosmos are susceptible to powdery mildew, so it’s important to monitor them for signs of disease and take action accordingly.

With a little care and attention, chocolate cosmos can be a stunning and low-maintenance addition to your garden.

Do cosmos flowers come back next year?

Cosmos (Cosmos spp.) has a relatively high rate of reseeding. That means it sheds many seeds that bring it back each year, without becoming an overwhelming nuisance.

In order for the cosmos itself to reseed you must leave the flower faded long enough to allow seeds to grow.

Does cosmos come back every year?

The answer is yes, they do! Cosmos (Cosmos spp.) has a relatively high rate of reseeding. That means it sheds many seeds that bring it back each year, without becoming an overwhelming nuisance. In order for the cosmos itself to reseed you must leave the flower faded long enough to allow seeds to grow.

Once the cosmos seeds have germinated, you will see small seedlings emerge from the soil in spring. These seedlings can then be transplanting to other areas of your garden or yard, or simply left where they are to grow into full-fledged cosmos plants.

So, if you want to enjoy these beautiful flowers year after year, make sure to leave some of them behind to reseed!

How do I get more blooms on cosmos?

Cosmos are beautiful and easy to grow flowers that will add color to any garden. To get the most blooms, it is important to use the right fertilizer.

More Bloom or Bloom Booster fertilizer, which has a lower level of nitrogen and a higher level of phosphorus, will help promote healthy flowers.

Bone meal is also an effective way to encourage blooms. When applying fertilizer, it is best to only do so when you are planting the cosmos.

How do I know if my cosmos is annual or perennial?

Cosmos are one of the easiest flowers to grow from seed, and they come in a wide range of colors. But how can you tell if your cosmos is annual or perennial? The majority of cosmos are actually perennials, which means they won’t appear each year unless you replant the seeds in the spring.

The one exception is the chocolate cosmos, also known as cosmos atrosanguineus. This species grows from a tuber, similar to a dahlia, and is perennial. So if you want to ensure that your cosmos will bloom each year, be sure to plant the chocolate variety!

Is cosmos flower an annual?

Cosmos is a genus of flowering plants that includes both annual and perennial species. The annual species are not typically winter-hardy, but they can easily self-seed during the summer months. The most commonly known annual species is Cosmos sulphureus, which is also known as sulfur cosmos or yellow cosmos.

This plant ranges in height from 1 to 7 feet and produces showy yellow flowers. Perennial species of cosmos are typically more resilient to cold weather and can live for several years with proper care.

These plants produce a wide variety of blooms in colors that include white, pink, purple, and red. Whether you choose an annual or perennial species, cosmos flowers are sure to add beauty to your garden.

How long do cosmos bloom last?

Cosmos are one of the easiest flowers to grow, and they provide a cheerful display of color in the garden from summer until fall.

One common question about these pretty annuals is “How long do cosmos bloom last?” The answer is that each individual flower will only last for four or six days, but there are so many blossoms on each stem that the plant will continue to bloom for several weeks.

To extend the blooming period, keep the plants picked regularly and deadhead all spent flowers before they have a chance to set seed. With a little care, cosmos can bring beauty to the garden all season long.

Jessica Miles

Jessica Miles is a writer for Botanique Boutique, a plant and gardening blog. She has always loved plants, flowers, and anything green. When she was younger, she used to watch her grandfather garden and would be in awe of the beautiful flowers he would grow. Now Jessica writes about all things related to plants and gardening - from beginner tips on how to start growing your own plants, to in-depth guides on caring for a specific type of flower or plant. She loves helping others learn about this fascinating hobby, and hopes that her writing will inspire people to get outside and enjoy nature!

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