10 Fast Growing Flower Seeds

Quick blooming flowers to grow from seed

In this article I’ve put together a list of the fastest growing flower seeds that will fill up your garden with beautiful bright blooms in the shortest time possible.

Most of these seeds germinate in less than a week and flower in about two months.

These flower seeds are also great for the classroom and teaching kids about gardening at home.

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full sun annual


1. Petunia (Petunia × atkinsiana)

Petunias are popular, fast growing annuals that bloom all summer.

They love warm weather and look great in garden beds, hanging baskets and containers.

Petunia seeds can be sprinkled in the garden in early spring. They can also be started indoors about 10 weeks before planting time.

The seeds will germinate in 7 – 10 days and the plants will bloom in about 12 weeks.

Petunia flowers

2. Poppy (Papaver somniferum)

Poppies are great for brightening up your garden with their beautiful orange, yellow, pink and red flowers.

Poppies don’t like to be transplanted, so it’s best to plant them directly in the garden.

The seeds need light to germinate, so just press the seeds lightly into the soil with your finger.

It takes 10 – 21 days for the seeds to germinate and 9 – 12 weeks for the plants to bloom.

Most varieties of poppies re-seed readily, so you’ll have free plants the next year.

Poppy flowers

3. Sunflower (Helianthus)

Sunflowers are popular, rapid growing annuals with large yellow flowers.

The seeds can be planted in spring when the soil is warm and they’ll germinate in 7 – 10 days and begin to bloom in about 10 weeks. [1]

Sunflowers grow best in full sun and may require staking to protect against high winds and heavy rain.

Fast growing sunflowers

4. Nasturtiums (Tropaeolum majus)

Nasturtiums are fast growing annuals that have bright orange, yellow and red flowers.

The flowers, leaves and seeds are edible and have a peppery taste similar to watercress.

Nasturtium seeds germinate best in warm soil and they can be planted directly in the garden or in containers after the last frost of the season.

It takes about 10 to 14 days for nasturtium seeds to germinate and they will begin blooming in 5 to 7 weeks.

In cold climates, or to get an earlier start, you can plant the seeds in containers indoors and transplant them to the garden in spring.

RELATED: 10 Best Trailing Annual Flowers

Nasturtium flowers

5. Sweet Alyssum (Lobularia maritima)

Sweet Alyssum is a quick growing annual that produces masses of tiny fragrant flowers. They’re great for ground covers, rock gardens and pots.

Sweet alyssum seeds germinate fast, usually in about 4 days.

The seeds can be started indoors a month before ​the last frost, or outdoors in the garden after the risk frost has passed.

Sweet alyssums can be grown in a spot with full sun or partial shade.

Sweet alyssum

6. Marigold (Tagetes)

Marigolds are popular, fast growing annuals with beautiful bright orange and yellow flowers.

The seeds can be planted directly in the garden after the risk of frost has passed, or started indoors four to six weeks before the last frost of the season.

Sprinkle the seeds over the soil and press down lightly with your finger.

Marigold seeds germinate in less than a week when planted in warm, moist soil and will begin to flower in about 8 weeks.

Marigold flowers

7. Zinnia (Zinnia elegans)

Zinnia is one of the fastest-growing annuals from seed.

The seeds germinate in 7 to 10 days and start blooming in 60 to 70 days.

Zinnia doesn’t like being transplanted so it’s best to plant the seeds directly in the garden in spring when the weather is warm.

RELATED: 15 Colorful Annual Flowers

Fast growing flower seeds

8. Cornflower (Centaurea cyanus)

Cornflowers, also known as Bachelor’s Buttons, are quick-growing flowers that are great for attracting bees, butterflies and other beneficial insects to the garden.

As well as blue, the flowers also come in pink, purple, white and red varieties. The flowers are edible and can be used as a garnish or added to salads.

Cornflower seeds germinate in 7 – 10 days and the plants begin to bloom in about 90 days.

Cornflowers grow best in sunny spots with rich, fertile soil.


9. Nigella (Nigella sativa)

Nigella has beautiful flowers in a range of colors including blue, white, pink and purple.

They grow best from seeds planted directly in the garden rather than from transplanted seedlings.

Nigella grows well in full sun, but the plants can decline rapidly in very hot weather.

The seeds germinate in 7 – 14 days and it’s a good idea to sow a few rounds of seeds from late spring to early summer because they only bloom for a few weeks.

Nigella flower

10. Cosmos (Cosmos bipinnatus)

Cosmos are easy to grow annuals that come in a range of colors including pink, red, orange, yellow, maroon and white.

They’re fast growing, drought tolerant and grow best in soil that isn’t too rich.

Cosmos prefer a position in full sun but they need protection from strong winds.

The seeds will germinate in 5 – 7 days and they’ll begin to bloom in about 7 weeks.

Cosmos flower

Planting these fast growing flower seeds is a great way to bring color to your garden, pots and containers with masses of beautiful flowers.

Here’s a handy video to show you how to grow Zinnia flowers from seed. They’re one of the fastest growing flowers from seed and great for brightening up your garden.


What are your favorite fast growing flowers? Let me know in the comments below.

Are you on Pinterest? I have boards dedicated to Flower Gardening and Gardening Tips that you may enjoy. You can also find me on Facebook.

fast growing flower seeds

Fast growing flower seeds

Kelly Martin

Hi, I'm Kelly Martin, a landscape gardener and designer with over 10 years experience. I have a passion for small space gardening and I love designing and creating beautiful outdoor spaces that maximize the potential of small urban gardens. Read more

This Post Has 15 Comments

  1. Stacie

    I’m going to grow all of these next year. I love the colors of the blooms, and I love that they bloom out so quickly. I’m a “now” kind of girl. LOL

  2. GiGi Eats

    I do love flowers but they’re just so hard to maintain! For me at least, ha!

  3. Terri Steffes

    I grow most of these by seed and you are 100% correct! Love these flowers, and I would use any of them in my cutting garden.

  4. joy

    I do love zinnias. Beautiful. They remind me a bit of daisies that i think are some of the happiest and friendliest of flowers.

  5. Emman Damian

    I love Petunia (Petunia × atkinsiana)! They are so cute and very easy to grow. My mom loves them!

  6. Nigar Rahman

    Interesting! Actually when we plant a flower seed then we feel so restless to see our first flower! But these flowers are really lovable and don’t take our patience. Personally i love Petunia and Poppy. I have these plants in my garden.

  7. Kristine Nicole Alessandra

    I tried to grow Marigolds from seeds but when the seedlings have sprouted and they had like about 8 leaves, they started to wilt and die. 🙁 I don’t know what I did wrong but I will try again.

  8. Subhashish Roy

    Just going through your post and seeing the flowers refreshed me. Beautiful colors and beautiful flowers. We have always had a garden during childhood and a lot of these flowers used to be in our garden. Not now anymore due to shortage of space.

  9. Ntensibe Edgar Michael

    Nnniiiccceeeee….I am always fascinated by the “Poppies”. They always have this ability to grow “non-stop” throughout the year.

  10. Heather

    We were just discussing planting some flowers in our garden. This is exactly the info I needed!

  11. Tiffany La Forge-Grau

    It is crazy how quickly some of these flowers can bloom. These are great for us impatient gardeners.

  12. Dana Brillante-Peller

    Cosmos and petunias are two of our favorite flowers to grow throughout our yard. Petunias have such vibrant colors.

  13. surekha-dreamingloud

    Sunflowers and poppies looks so pretty..! It’s nice to know that they grow easily. It would be fun to plant them.

  14. Anwinafri

    Cosmos! Especially the candy stripe ones. I hope I get a nicely filled flower bed full of flowering Cosmos this year!

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