23 Gorgeous September Flowers to Keep Your Garden Colorful

As summer fades, September arrives with fresh, cheerful blooms that keep gardens alive with vibrant colour. These late bloomers are perfect for bridging the gap between sunny summer days and the crisp fall season. From bold dahlias to delicate anemones, each one brings its own charm to your outdoor space.

I’ve gathered a list of 23 September-blooming plants that can brighten your garden during cooler days. These flowers don’t just look beautiful, they attract pollinators, add variety, and give your garden a lively touch. Let’s take a look at these stunning plants that will keep your fall garden full of joy!

1. Aster

Asters are one of the prettiest flowers you can grow in September. Their star-shaped blooms come in shades of purple, pink, blue, and white, making them a colorful highlight in the garden. Bees and butterflies love them, so they’re perfect for pollinator-friendly spaces. These hardy perennials can grow from 1 to 4 feet tall and thrive in sunny spots with well-drained soil. They keep blooming even as cooler weather sets in, giving your garden a soft, cheerful glow.

Popular Varieties

• New England Aster: Tall plants with vibrant purple flowers that can reach up to 6 feet.
  
• Roofing Aster: A compact option with lavender flowers, perfect for small gardens.
  

2. Chrysanthemum

Chrysanthemums, or “mums,” are the stars of fall gardens. Their bold yellow, orange, red, and white flowers bring instant cheer to flower beds and containers. Blooming from September through the fall, they make your outdoor space look festive and bright. These sun-loving plants thrive in well-drained soil and only need regular watering to keep their flowers fresh. With their long-lasting blooms, mums are often seen at fall festivals and celebrations.

Popular Varieties

• Garden Mum: Classic, full blooms that last until late fall.
  
• Spider Mum: A dramatic variety with long, spiky petals that stand out.
  

3. Sedum

Sedum, also called stonecrop, is a low-maintenance plant that shines in September. Its tiny, star-shaped flowers bloom in shades of pink, yellow, or red, giving your garden a unique texture. This hardy succulent is perfect for busy gardeners because it can grow in poor soil and withstand drought. As fall arrives, sedum holds its color and structure, even after the first frost. Its thick leaves and clustered blooms add variety alongside more traditional fall flowers.

Popular Varieties

• Autumn Joy: Pink flowers that deepen into rust-red in fall.
  
• Dragon’s Blood: A groundcover with red foliage and bright pink flowers.
  

4. Goldenrod

Goldenrod lights up your garden in September with bright golden-yellow flowers. While some mistake it for a weed, it’s actually a beautiful plant that attracts bees and butterflies. Its tall, graceful stalks add structure and height to flower beds. Goldenrod is very adaptable, thriving in both sun and partial shade, and can grow in many soil types. Its blooms look stunning in natural, wild-style gardens.

Popular Varieties

• Solidago canadensis: A native variety that grows tall and attracts pollinators.
  
• Goldenrod ‘Fireworks’: Arching stems with yellow flowers that resemble bursts of light.
  

5. Japanese Anemone

Japanese Anemones are elegant flowers that bloom in soft pink and white during September. They rise above their green foliage on tall stems, adding charm and movement to your garden. These perennials do well in partial shade with moist, well-drained soil, making them great for woodland-style gardens. They’re hardy plants that keep their beauty even in cooler weather, giving your garden a touch of grace as summer fades.

Popular Varieties

• Honorine Jobert: Pure white flowers that stand out beautifully in shady spots.
  
• September Charm: Soft pink blooms with a long flowering season.
  

6. Salvia

Salvia is a late-summer favorite with tall spikes of flowers in purple, red, or blue. It’s a magnet for butterflies and hummingbirds, making your garden feel alive with activity. These plants love full sun and can handle dry conditions, so they’re easy to care for. They keep blooming through September, adding vertical interest to flower beds. Salvia works well in both modern and cottage-style gardens.

Popular Varieties

• Salvia nemorosa: Tall purple spikes that bloom all season long.
  
• Salvia ‘Hot Lips’: Red and white bicolor flowers that add a fun twist.
  

7. Helenium

Helenium, also called sneezeweed, adds warm shades of yellow, orange, and red to your September garden. Its daisy-like blooms look like little bursts of sunshine. This plant thrives in sunny areas with moist soil, often near ponds or rain gardens. It’s also great for cutting, so you can bring its cheerful colors indoors. Butterflies flock to its blooms, making it a pollinator-friendly choice.

Popular Varieties

• Helenium ‘Mardi Gras’: Blooms that change colors as they age, from yellow to red.
  
• Helenium ‘Autumnale’: Tall plants with vibrant, multicolored flowers.
  

8. Verbena

Verbena is a garden favorite with clusters of tiny flowers in purple, red, pink, or white. Blooming into September, it creates a lively splash of color and attracts hummingbirds and butterflies. It grows best in sunny spots with well-drained soil, and it’s a good option for both borders and hanging baskets. Some varieties trail beautifully, making them perfect for cascading displays.

Popular Varieties

• Verbena bonariensis: Tall, airy stems with purple flowers.
  
• Trailing Verbena: A trailing type great for baskets and edges.
  

9. Dahlia

Dahlias are bold, dramatic flowers that keep gardens colorful into September. Their blooms come in many shapes and colors, from large dinner-plate sizes to smaller, neat flowers. Dahlias prefer sunny spots with rich soil, and they reward your care with stunning displays. They’re also a great choice for cut flowers, brightening up indoor spaces with their festive beauty.

Popular Varieties

• Café au Lait: Large, creamy-white blooms that are very popular in bouquets.
  
• Bishop of Llandaff: Striking red flowers with dark foliage.
  

10. Sunflower

Sunflowers are iconic summer plants, but some varieties bloom into September, adding a cheerful glow. With their tall stalks and golden petals, they’re perfect for brightening large spaces. They grow easily in sunny, well-drained soil and also provide seeds for birds. Whether tall or compact, sunflowers bring happiness wherever they grow.

Popular Varieties

• Mammoth Grey Stripe: Huge flowers with edible seeds.
  
• Teddy Bear: A shorter variety with fluffy, pom-pom blooms.
  

11. Zinnia

Zinnias bring a burst of vibrant color into your garden during September. These easy-to-grow flowers come in shades of red, pink, orange, yellow, and purple. They thrive in sunny spots with well-drained soil and can handle heat well. Zinnias bloom continuously until frost, keeping your garden bright late into the season. They’re also perfect for cutting, so you can enjoy their colors indoors too.

Popular Varieties

• Zinnia ‘State Fair’: Produces large, colorful blooms for garden beds.
  
• Zinnia ‘Profusion’: Compact plants that are disease-resistant and bloom nonstop.
  

12. Coreopsis

Coreopsis, also called tickseed, adds cheerful yellow and gold flowers to your September garden. This perennial begins blooming in summer and keeps going into fall. It loves full sun and is drought-tolerant once established, making it easy to grow. Its bright flowers also attract butterflies, which makes the garden even livelier. Coreopsis looks beautiful in borders or as part of a wildflower-style garden.

Popular Varieties

• Coreopsis ‘Moonbeam’: Soft yellow flowers that bloom heavily all season.
  
• Coreopsis ‘Jethro Tull’: Golden blooms with a trumpet-like shape.
  

13. Phlox

Phlox is a classic garden flower that blooms in pink, purple, red, or white during late summer and September. These fragrant flowers attract butterflies and hummingbirds, adding life to your garden. Phlox thrives in sunny spots with well-drained soil and can grow tall, making it great for the back of flower beds. Their long-lasting blooms are perfect for adding color and height as fall approaches.

Popular Varieties

• Phlox paniculata ‘David’: White blooms that resist powdery mildew.
  
• Phlox ‘Starfire’: Brilliant red flowers that make a bold statement.
  

14. Marigold

Marigolds are garden favorites that bloom from spring through fall, including September. Their sunny yellow, orange, and red flowers not only look cheerful but also help repel pests. These hardy plants grow easily in sunny spots and a variety of soils. They’re perfect for children to grow since they sprout quickly and bloom all season. Marigolds also look lovely in borders and pots.

Popular Varieties

• French Marigold: Small, compact plants with bright, fragrant blooms.
  
• African Marigold: Taller plants with large, showy flowers.
  

15. Toad Lily

Toad lilies are unique flowers that bloom in late summer and early fall. Their spotted, orchid-like blooms add a whimsical touch to shady areas of your garden. They prefer moist soil and do well in woodland-style settings. These perennials are hardy and bloom right when many other flowers are fading. Their unusual beauty makes them a great conversation starter in the garden.

Popular Varieties

• Tricyrtis formosana: Purple flowers with striking speckles.
  
• Tricyrtis ‘Lightning Strike’: Lavender blooms with yellow-striped leaves.
  

16. Balloon Flower

Balloon flowers get their name from their balloon-shaped buds that pop open into star-shaped blooms. They bloom in shades of blue, purple, and white and last into September. These flowers love full sun to partial shade and grow easily in well-drained soil. Balloon flowers also attract butterflies, making your garden even more lively. Their charming shape makes them stand out in borders or containers.

Popular Varieties

• Platycodon ‘Sentimental Blue’: A compact variety with bright blue flowers.
  
• Platycodon ‘Astra White’: Produces pretty white blooms with clean green foliage.
  

17. Begonia

Begonias are versatile plants known for their colorful flowers and attractive foliage. Blooming in red, pink, orange, and white, some varieties last into September. They grow best in partial shade, making them perfect for brightening darker spots. Begonias thrive in containers, hanging baskets, and borders, adding lush texture to the garden. Their forgiving nature makes them great for beginners too.

Popular Varieties

• Wax Begonia: Small, glossy leaves with clusters of colorful flowers.
  
• Tuberous Begonia: Large, showy blooms that look stunning in pots.
  

18. Impatiens

Impatiens are shade-loving plants that bloom all summer long into September. Their flowers come in pink, red, white, and purple, adding cheerful color to shady corners. These plants prefer moist, well-drained soil and are very easy to care for. They work beautifully in containers, borders, or hanging baskets. Impatiens provide continuous color when other flowers begin to fade.

Popular Varieties

• Busy Lizzie: Compact plants with bright, nonstop blooms.
  
• New Guinea Impatiens: Larger flowers that can handle more sun than traditional types.
  

19. Fuchsia

Fuchsia plants are known for their dangling, bell-shaped flowers in shades of pink, purple, and white. They bloom all summer and continue into September, adding a delicate touch to your garden. Fuchsias love cooler weather, partial shade, and moist soil, making them perfect for mild fall climates. They grow beautifully in hanging baskets, where their blooms can cascade gracefully.

Popular Varieties

• Fuchsia ‘Angel’s Earrings’: Long, trailing stems covered in flowers.
  
• Fuchsia ‘Gartenmeister Bonstedt’: Striking red and purple blooms.
  

20. Autumn Crocus

Autumn Crocus surprises gardeners by blooming in late September just when the garden seems to be slowing down. Its goblet-shaped flowers appear in shades of pink, lilac, or white. These bulbs grow best in well-drained soil with sun or partial shade. They’re deer-resistant and low-maintenance, making them easy to enjoy. Autumn crocuses add a magical touch to fall landscapes.

Popular Varieties

• Colchicum autumnale: A classic variety with pretty pink flowers.
  
• Colchicum ‘Waterlily’: Full, rounded flowers that resemble water lilies.
  

21. Hydrangea

Hydrangeas are beloved for their big, fluffy blooms that last into September. Their colors change based on soil pH, giving you shades of pink, blue, white, or purple. These shrubs grow well in partial shade with moist soil and are perfect for garden beds or borders. Hydrangeas are a bit fussy with care but reward you with breathtaking flowers. They make stunning cut arrangements for the home too.

Popular Varieties

• Hydrangea macrophylla: Classic round blooms in changing colors.
  
• Hydrangea ‘Limelight’: Lime-green flowers that blush pink in fall.
  

22. Lobelia

Lobelia adds splashes of deep blue, purple, or red to your September garden. This trailing plant looks wonderful in hanging baskets, containers, or along borders. It prefers moist soil and sunny to partly shady conditions, making it quite adaptable. Lobelia blooms into early fall, adding cool tones when warmer shades dominate. Its trailing stems create a graceful, flowing look.

Popular Varieties

• Lobelia erinus: A trailing type perfect for baskets and window boxes.
  
• Lobelia ‘Sparkle Red’: A unique variety with bold red flowers.
  

23. Gaillardia

Gaillardia, or blanket flower, fills your September garden with sunset shades of red, orange, and yellow. Its daisy-like blooms last from summer into fall and attract plenty of butterflies. These tough perennials thrive in sunny, dry spots with well-drained soil. Once established, they can handle drought, making them easy to care for. Gaillardia’s warm colors bring a cozy, autumn feel to your garden.

Popular Varieties

• Gaillardia ‘Goblin’: Compact plants with bold, warm colors.
  
• Gaillardia ‘Arizona Sun’: Striking red and yellow flowers that bloom all season.

Tips & Tricks for Growing September Flowers

• Plant in Layers: Mix early-fall bloomers like Rudbeckia with later ones such as Chrysanthemums to keep color going all season.
  
• Deadhead Regularly: Remove faded blooms to encourage more flowers and extend blooming time.
  
• Choose Pollinator-Friendly Plants: September flowers like Asters and Sedums attract bees and butterflies, helping your garden thrive.
  
• Mind the Soil: Enrich soil with compost in late summer to give your flowers the nutrients they need for a strong fall display.
  
• Mix Colors & Heights: Combine tall blooms like Dahlias with groundcovers like Hardy Begonias for a fuller, balanced look.
  
• Container Options: Many September flowers, including Anemones and Marigolds, grow beautifully in pots if you’re short on space.
  
• Water Smartly: Cooler days mean less evaporation, water deeply but less often to keep roots healthy.
  

Wrap-Up

September may mark the start of fall, but it’s far from the end of garden beauty. With the right flowers, your outdoor space can glow with warm, rich colors even as the days grow cooler. From bold Dahlias to delicate Anemones, each bloom adds a special charm to the changing season. Planting these September stunners not only keeps your garden vibrant but also supports pollinators preparing for winter. So, grab your gardening gloves and let your yard shine with color all the way into autumn!