Want beautiful flowers without waiting all summer? These fast-growing blooms can reward you with colour in as little as six to eight weeks.
One of the hardest parts of gardening is waiting.
You sow tiny seeds, water them carefully, and then… nothing seems to happen for weeks.
Fortunately, not every flower takes months to bloom.
Some annual flowers grow incredibly quickly, producing colourful blooms just six to eight weeks after sowing. They’re perfect if you’re starting a little later in the season, gardening with children, filling empty borders or simply want quicker results.
Here are some of the fastest flowers you can grow.
1. Calendula
If you’re looking for almost instant gratification in the garden, calendula is hard to beat.
Often called pot marigold, calendula produces cheerful orange and yellow flowers in as little as 6–8 weeks from sowing, making it one of the fastest flowers you can grow from seed.
It’s also wonderfully forgiving. Even if you’re completely new to gardening, calendula is likely to reward you with masses of blooms throughout summer.
The flowers aren’t just attractive either—they’re excellent for pollinators, the petals are edible, and regular deadheading encourages even more flowers.
Whether you’re filling borders, brightening containers or creating a cottage garden, calendula is an excellent place to start.
Why You’ll Love Calendula
- Flowers in around 6–8 weeks
- Perfect for beginners
- Long flowering season
- Loved by bees and butterflies
- Edible petals for salads and baking
- Great in pots and borders
Growing Tips
Calendula grows best in full sun but will also tolerate light shade.
Sow seeds directly into the ground after the last frost or start them indoors a few weeks earlier for an even earlier display.
Water regularly while seedlings establish, then simply deadhead spent flowers to keep new buds appearing all summer long.
Ready to Grow Your Own?
If you’re ready to plant calendula, you’ll typically find these products available:
- 🌼 Calendula seed packets
- 🪴 Young calendula plug plants (during the growing season)
- 🌱 Seed starting trays
- 🪴 Seed compost
- 💧 Watering can with a fine rose
2. Nasturtiums
If you want colourful flowers with almost no effort, nasturtiums are a brilliant choice.
These fast-growing annuals produce vibrant red, orange, yellow and cream blooms in as little as 6–8 weeks from sowing. Their round, lily pad-shaped leaves are just as attractive as the flowers, making them a favourite for pots, hanging baskets and cottage gardens.
One of the best things about nasturtiums is that almost the entire plant is edible. Both the flowers and leaves have a peppery flavour that’s delicious in salads, while the blooms are also loved by bees and other pollinators.
Why You’ll Love Nasturtiums
- Flowers in around 6–8 weeks
- Extremely easy from seed
- Edible flowers and leaves
- Excellent for pollinators
- Perfect for pots, borders and hanging baskets
- Great companion plant for vegetable gardens
Growing Tips
Nasturtiums prefer full sun and well-draining soil. Avoid rich compost or high-nitrogen fertilisers, as these encourage leafy growth instead of flowers.
Once established, they’re surprisingly drought tolerant and require very little maintenance.
Ready to Grow Your Own?
You’ll usually find:
3. Sweet Alyssum
Sweet alyssum may have tiny flowers, but it makes a huge impact.
Within 6–7 weeks, this fast-growing annual produces masses of delicate white, pink or purple flowers with a beautiful honey-like fragrance.
Its low-growing habit makes it ideal for edging paths, filling gaps in borders or spilling beautifully over containers and hanging baskets.
Why You’ll Love Sweet Alyssum
- Flowers in around 6–7 weeks
- Wonderful fragrance
- Excellent for bees and butterflies
- Great ground cover
- Ideal for containers and baskets
- Long flowering season
Growing Tips
Plant sweet alyssum in full sun or partial shade and keep the soil lightly moist while plants establish.
If flowering slows during very hot weather, simply trim the plants lightly and they’ll often bounce back with fresh blooms.
Ready to Grow Your Own?
You’ll typically find:
4. California Poppies
California poppies are proof that beautiful flowers don’t have to be difficult.
These silky, cup-shaped blooms often appear within 6–8 weeks and continue flowering throughout summer with very little attention.
Their vibrant orange flowers are iconic, although you’ll also find yellow, cream and pink varieties.
Why You’ll Love California Poppies
- Flowers in around 6–8 weeks
- Very drought tolerant
- Excellent for sunny gardens
- Low maintenance
- Pollinator friendly
- Often self-seed for next year
Growing Tips
California poppies dislike having their roots disturbed, so sow seeds directly where you want them to flower.
Choose a sunny position with free-draining soil and avoid overwatering.
Ready to Grow Your Own?
Look out for:
5. Cornflowers
Cornflowers are a classic cottage garden favourite, producing stunning blue flowers just 7–8 weeks after sowing.
They’re incredibly easy to grow and make excellent cut flowers, while also attracting bees, butterflies and other beneficial insects.
Why You’ll Love Cornflowers
- Flowers in around 7–8 weeks
- Beautiful cut flowers
- Easy for beginners
- Pollinator friendly
- Excellent for cottage gardens
- Long flowering period
Growing Tips
Cornflowers grow best in full sun and appreciate regular deadheading to encourage fresh blooms throughout summer.
They’re also excellent for wildlife-friendly gardens.
Ready to Grow Your Own?
You’ll often find:
6. Dwarf Cosmos
Cosmos are famous for their delicate daisy-like flowers and airy foliage.
While taller varieties can take longer to bloom, many dwarf varieties begin flowering in around 7–8 weeks, making them ideal if you don’t want to wait all summer.
They continue flowering for months with regular deadheading.
Why You’ll Love Dwarf Cosmos
- Flowers in around 7–8 weeks
- Long flowering season
- Excellent cut flowers
- Loved by pollinators
- Perfect for pots and borders
- Easy to grow
Growing Tips
Cosmos thrive in full sun and well-drained soil.
Avoid overfeeding, as rich soil often produces lots of leaves but fewer flowers.
Ready to Grow Your Own?
You can usually buy:
7. French Marigolds
French marigolds are one of the easiest flowers you can grow from seed.
Their cheerful yellow, orange and deep red blooms often appear within 6–8 weeks, providing colour right through summer.
They’re also widely used as companion plants to help deter certain garden pests.
Why You’ll Love French Marigolds
- Flowers in around 6–8 weeks
- Perfect for beginners
- Bright, long-lasting blooms
- Excellent companion plant
- Great for containers
- Pollinator friendly
Growing Tips
Plant in full sun and remove faded flowers regularly to encourage continuous blooming.
Marigolds cope well with heat and are ideal for sunny patios.
Ready to Grow Your Own?
8. Phacelia
Phacelia might not be as well known as marigolds or cosmos, but it’s one of the very best flowers for pollinators.
Within 6–8 weeks, it produces elegant purple-blue flowers that attract bees in huge numbers.
It’s also widely used as a green manure to improve soil health.
Why You’ll Love Phacelia
- Flowers in around 6–8 weeks
- One of the best flowers for bees
- Beautiful lavender-blue blooms
- Easy to grow
- Improves soil structure
- Excellent wildlife plant
Growing Tips
Phacelia grows best in full sun and can be sown directly into prepared soil.
Allow some flowers to go to seed if you’d like plants to return naturally.
Ready to Grow Your Own?
Look for:
9. Baby’s Blue Eyes (Nemophila)
Baby’s Blue Eyes produces charming sky-blue flowers that create beautiful carpets of colour in spring and early summer.
Many varieties bloom within 7–8 weeks, making them another excellent option if you’re looking for quick results.
Why You’ll Love Baby’s Blue Eyes
- Flowers in around 7–8 weeks
- Beautiful blue blooms
- Ideal ground cover
- Excellent for borders
- Pollinator friendly
- Easy from seed
Growing Tips
These flowers prefer full sun to partial shade and appreciate consistently moist soil while establishing.
They’re particularly effective planted in drifts.
Ready to Grow Your Own?
You’ll usually find:
10. Dwarf Sunflowers
If you thought all sunflowers took months to bloom, think again.
Compact varieties such as ‘Sunny Smile’, ‘Pacino’ and ‘Sunspot’ can produce cheerful yellow flowers in as little as 7–8 weeks, making them perfect for patios and smaller gardens.
They’re also a fantastic choice if you’re gardening with children, as the rapid growth is incredibly rewarding.
Why You’ll Love Dwarf Sunflowers
- Flowers in around 7–8 weeks
- Fantastic for pots
- Easy for children to grow
- Loved by bees
- Bright, cheerful flowers
- Excellent patio plant
Growing Tips
Choose a sunny position and keep young plants well watered while they’re establishing.
Dwarf varieties generally don’t need staking, making them lower maintenance than their giant cousins.
Ready to Grow Your Own?
You’ll commonly find:
Tips for Faster Flowers
Even fast-growing flowers benefit from the right conditions.
To encourage the quickest blooms:
- Sow during the recommended season.
- Give seedlings plenty of sunlight.
- Avoid overcrowding.
- Water consistently while young.
- Feed lightly once flower buds appear.
- Deadhead regularly to encourage continuous blooms.
Healthy plants always grow faster than stressed ones.
Can You Speed Up Flowering?
Not dramatically—but you can avoid slowing plants down.
The biggest reasons flowers take longer include:
- Too little sunlight
- Cold temperatures
- Overwatering
- Poor drainage
- Overfeeding with nitrogen
- Crowded seedlings
Giving plants the conditions they prefer helps them reach flowering size as quickly as possible.
Best Flowers for Containers
If you’re planting pots or balconies, these are excellent choices:
- Calendula
- Nasturtiums
- French marigolds
- Sweet alyssum
- Dwarf cosmos
- Dwarf sunflowers
Most produce colourful displays within two months.
Final Thoughts
If you’re eager to see colour in your garden as quickly as possible, you don’t have to wait all season.
Fast-growing flowers like calendula, nasturtiums and marigolds can reward you with beautiful blooms in as little as six weeks, making them perfect for beginners and impatient gardeners alike.
Choose a sunny spot, sow at the right time, keep your seedlings watered, and you’ll be enjoying a colourful display before you know it.