15 Best Flowers to Plant in September

September is a fantastic time to give your garden a refresh as summer fades and cooler autumn weather begins.

September is a wonderful time to refresh your garden with new blooms as the summer heat wanes and cooler weather approaches.

This month marks the transition from summer to fall, offering ideal conditions for planting a wide variety of flowers that will brighten your garden with beautiful colors well into the cooler months.

Whether you’re looking to add perennials that will return year after year or annuals that provide a burst of seasonal color, there are plenty of options for flowers to plant in September.

In this article, we’ll explore the best flowers to plant in September to keep your garden vibrant and lively.

1. Chrysanthemums (Mums)

Chrysanthemums, commonly known as mums, are the quintessential fall flower, offering a wide range of colors such as yellow, red, orange, purple, and white.

They are hardy, easy to grow, and bloom from late summer through fall, adding bright color to your garden as the season changes.

• Why Plant in September: Mums thrive in cooler temperatures, making September the perfect time to plant them. They establish roots quickly in the fall and are perfect for filling in garden gaps or refreshing tired flower beds.
• Care Tips: Plant chrysanthemums in well-drained soil and a sunny location. Water them regularly but avoid overwatering to prevent root rot.

2. Pansies

Pansies are versatile, cool-season flowers that thrive in the fall.

They come in a variety of colors, including blue, purple, yellow, and red, and are known for their charming, “face-like” blooms.

• Why Plant in September: Pansies are hardy flowers that can withstand cooler temperatures and light frosts, making them ideal for fall planting. They provide bright color through the autumn and, in some climates, can even bloom again in early spring.
• Care Tips: Plant pansies in well-drained soil and a location with partial to full sun. Water them consistently, and consider mulching around the base to retain moisture.

3. Asters

Asters are daisy-like perennials that come in various shades of purple, blue, pink, and white.

They bloom profusely in the fall, attracting bees, butterflies, and other pollinators to your garden.

• Why Plant in September: Asters prefer cooler weather and bloom in the fall, making them an excellent choice for September planting. They are great for adding height and texture to your garden beds.
• Care Tips: Plant asters in full sun and well-drained soil. They are relatively low-maintenance but benefit from regular watering and occasional deadheading to promote continued blooming.

4. Marigolds

Marigolds are cheerful annuals known for their bright orange, yellow, and red flowers.

They are easy to grow and can add a pop of color to your garden until the first frost.

• Why Plant in September: Marigolds thrive in cooler fall weather and can continue to bloom until the first hard frost. They are also excellent companion plants for vegetable gardens, as they help repel pests.
• Care Tips: Plant marigolds in full sun with well-drained soil. Water them moderately and deadhead spent flowers to encourage more blooms.

5. Sweet Alyssum

Sweet alyssum is a low-growing annual with clusters of tiny, fragrant flowers in white, pink, purple, or lavender.

It is perfect for borders, containers, and hanging baskets.

• Why Plant in September: Sweet alyssum loves cooler temperatures and can bloom continuously from fall through early winter. It is great for ground cover or adding a delicate touch to flower beds.
• Care Tips: Plant sweet alyssum in full sun to partial shade with well-drained soil. Keep the soil evenly moist but not waterlogged to ensure continuous blooms.

6. Violas

Violas are similar to pansies but tend to have smaller flowers.

They come in a variety of colors and are known for their delicate blooms and ability to thrive in cooler weather.

• Why Plant in September: Violas can handle cooler temperatures and light frost, making them ideal for fall planting. They provide a splash of color to your garden through the cooler months.
• Care Tips: Plant violas in well-drained soil with access to full or partial sun. Water them consistently and mulch around the base to retain moisture.

7. Dianthus

Dianthus, also known as pinks or carnations, are beautiful, fragrant flowers that come in shades of pink, red, white, and purple.

They add a touch of elegance and color to any garden.

• Why Plant in September: Dianthus are hardy perennials that thrive in cooler temperatures, making September the ideal time for planting. They can bloom into late fall and even survive mild winters.
• Care Tips: Plant dianthus in well-drained soil with full sun exposure. Water regularly, but avoid overwatering, as they prefer slightly dry conditions.

8. Snapdragons

Snapdragons are striking flowers with tall, spiky blooms that come in a variety of colors, including pink, red, yellow, and white.

They are perfect for adding vertical interest to flower beds and borders.

• Why Plant in September: Snapdragons prefer cooler weather and can bloom well into the fall. Planting them in September ensures they establish roots before winter and provide vibrant color in your garden.
• Care Tips: Plant snapdragons in full sun with well-drained soil. Water them regularly and deadhead spent flowers to encourage continuous blooming.

9. Sedum (Stonecrop)

Sedum is a hardy, drought-resistant perennial with thick, succulent leaves and clusters of star-shaped flowers that bloom in late summer to fall.

They come in various colors, including pink, red, yellow, and white.

• Why Plant in September: Sedum is extremely hardy and can withstand cooler temperatures, making it perfect for September planting. It adds texture and interest to rock gardens, borders, and containers.
• Care Tips: Plant sedum in full sun with well-drained soil. Sedum requires minimal watering and is very low maintenance, making it perfect for busy gardeners.

10. Japanese Anemones

Japanese anemones, also known as windflowers, are elegant perennials with delicate, cup-shaped flowers in shades of white, pink, or lavender.

They bloom from late summer through fall, adding grace to your garden.

• Why Plant in September: Japanese anemones thrive in cooler temperatures and can provide beautiful blooms into the fall. They are ideal for filling gaps in borders or creating a cottage garden look.
• Care Tips: Plant Japanese anemones in partial shade with well-drained, rich soil. Water regularly to keep the soil moist, especially during dry spells.

11. Ornamental Kale and Cabbage

Ornamental kale and cabbage are not grown for their edible qualities but for their stunning foliage in shades of purple, pink, white, and green. They add unique texture and color to fall gardens.

• Why Plant in September: These plants thrive in cooler temperatures and become more vibrant as the weather cools, making them ideal for September planting. They can tolerate frost and continue to look beautiful well into winter.
• Care Tips: Plant in full sun to partial shade with well-drained soil. Water regularly and remove any damaged leaves to maintain their appearance.

12. Heuchera (Coral Bells)

Heuchera, also known as coral bells, is a perennial plant valued for its colorful foliage in shades of green, burgundy, bronze, and silver.

• Why Plant in September: Heuchera thrives in cooler weather and provides vibrant color in the fall garden.
• Care Tips: Plant in partial shade with well-drained soil. Water regularly to keep the soil moist but not waterlogged.

13. Calendula

Calendula, or pot marigold, is a hardy annual with daisy-like flowers in shades of yellow and orange. It is known for its medicinal properties and long-lasting blooms.

• Why Plant in September: Calendula loves cooler temperatures and will bloom well into late fall.
• Care Tips: Plant in full sun with well-drained soil. Deadhead regularly to encourage more blooms.

14. Cyclamen

Cyclamen are charming, low-growing perennials with heart-shaped leaves and bright flowers in pink, red, purple, or white. They add a touch of elegance to your fall garden.

• Why Plant in September: Cyclamen thrive in cooler weather and can provide color throughout the fall.
• Care Tips: Plant in partial shade with well-drained soil. Water regularly but avoid waterlogging.

15. Liriope (Lilyturf)

Liriope, also known as lilyturf, is a tough, grass-like perennial with spikes of lavender or white flowers. It is excellent for ground cover or edging.

• Why Plant in September: Liriope is a hardy plant that can thrive in cooler temperatures, making it perfect for fall planting.
• Care Tips: Plant in partial to full shade with well-drained soil. Water regularly until established.

September is the perfect time to revitalize your garden with new flowers that will thrive in cooler temperatures and add beauty to your outdoor space well into the fall. Whether you prefer perennials like asters, dianthus, and heuchera, or hardy annuals like pansies, violas, and snapdragons, there are plenty of options to choose from.