Updated: October 8, 2022

Cosmos is a beautiful annual plant that is known for its daisy-like flowers that come in an array of bright colors such as pink, white, and red. It is a popular choice among gardeners due to its easy maintenance and ability to attract butterflies and bees. However, before you rush to your nearest nursery to purchase cosmos plants, it’s important to know the appropriate plant size for your garden.

Understanding Cosmos Plant Sizes

Cosmos plants come in different sizes, ranging from dwarf varieties that grow up to 1 foot tall to tall varieties that can reach up to 6 feet tall. The most common cosmos plant sizes are:

Dwarf Cosmos

Dwarf cosmos plants are perfect for small gardens, containers, and borders. They grow up to 1 foot tall and have a compact and bushy growth habit. The flowers of dwarf cosmos come in an array of colors, including pink, white, orange, and red.

Intermediate Cosmos

Intermediate cosmos grow up to 2-4 feet tall and have a more open and airy growth habit compared to dwarf cosmos. They are perfect for adding height and texture to garden beds or as a backdrop for shorter plants.

Tall Cosmos

Tall cosmos can grow up to 6 feet tall and have a very open, branching growth habit. They are perfect for creating a natural-looking screen or hedge. Tall cosmos also make excellent cut flowers due to their long stems.

Choosing the Right Cosmos Plant Size

When choosing the right cosmos plant size for your garden, there are several factors to consider:

Garden Space

Consider the available space in your garden when choosing the size of your cosmos plant. If you have a small garden or limited space, dwarf or intermediate cosmos would be the best option.


Consider the purpose of the cosmos plant in your garden. If you want to use it as a backdrop for shorter plants, intermediate cosmos would be the best option. If you want to create a natural-looking screen or hedge, tall cosmos would be the best option.


Consider the maintenance required for the cosmos plant size you choose. Dwarf cosmos require less maintenance compared to intermediate and tall cosmos, which may require staking to prevent them from falling over.

How to Plant Cosmos

Cosmos can be easily grown from seeds or purchased as seedlings from a nursery. Here are some tips on how to plant and care for your cosmos:

  1. Choose a site with full sun and well-draining soil.
  2. Sow the seeds or transplant seedlings into the soil after the threat of frost has passed.
  3. Water regularly but avoid overwatering as cosmos plants do not tolerate wet soil.
  4. Deadhead spent flowers regularly to encourage more blooms.
  5. Fertilize with a balanced fertilizer every two weeks during the growing season.


How long do cosmos plants bloom?

Cosmos plants bloom from mid-summer to fall, depending on the variety.

Do cosmos plants attract butterflies and bees?

Yes, cosmos plants are known to attract butterflies and bees, making them an excellent addition to any garden.

Can cosmos plants grow in containers?

Yes, dwarf cosmos are perfect for growing in containers.

Do I need to stake tall cosmos plants?

Yes, tall cosmos may require staking to prevent them from falling over.

Can I plant different sizes of cosmos together?

Yes, planting different sizes of cosmos together can create a beautiful and diverse garden bed.