Fall Annuals that Outshine the Rest

Fall doesn’t mean the end of annual flowers. In fact, the cooler weather and shorter days make way for a whole new repertoire of garden favorites that thrive in autumn. These fall annuals let you revive your tired summer garden with new colors that last all the way into the first frosts and sometimes even beyond. 

Why Plant Fall Annuals? 

Not all annuals thrive in the chill of Pennsylvania’s autumn. Instead of watching your summer flowers fade, you can plant new annuals that thrive in cooler nights. Flowers like mums, asters, and ornamental peppers are built for fall’s shifting weather. By choosing hardy blooms, you’ll enjoy color well into the season, even as the first frosts approach. Look for labels that specifically mention “fall annuals” to make your choices foolproof.

 

Autumn’s Best Seasonal Annuals 

• Mums
  No flower says “fall” quite like the chrysanthemum. Bursting with colors from deep burgundys to golden yellows, classic oranges and even white or deep-purples, mums are some of the best annuals for fall planting. They’re perfect for lining porches, brightening garden beds, or filling outdoor containers. With dense blooms, mums are a reliable favorite for gardeners who want a vibrant and cozy look that lasts until frost.
• Zinnias
  Though often thought of as a summer annual, zinnias keep blooming into Pennsylvania’s fall if given proper care. Their daisy-like petals and bold colors add cheer to gardens when other flowers are starting to fade. Zinnias love the sun and make for striking cut flowers that brighten indoor spaces too. In a fall garden, they can carry the warmth of summer right into the cozy sweater season.

 

• Celosia
  Celosia brings an unexpected flair to fall gardens by featuring its flame-like plumes and velvety textures. These flowers thrive in the cooler months and add drama to both borders and planters. Their bold hues of red, orange, and purple almost seem to glow in the crisp autumn light. Plant them where you need a pop of energy, and they’ll stand out against softer fall tones.
• Marigolds
  Marigolds are more than just cheery golden flowers—they’re guardians of the garden. Their warm, glowing colors perfectly echo Pennsylvania’s autumn leaves, and their pest-deterring qualities make them doubly useful. Whether planted in neat borders or scattered among vegetables, they bring both beauty and function. Their resilience ensures they thrive right up to frost, making them a gardener’s ally.
• Impatiens
  Shady spots don’t have to be drab in the fall, thanks to impatiens. These flowers thrive where sunlight is limited, brightening up porches and garden corners with their soft pastels and bold jewel tones. These flowers can continue blooming well into autumn, offering a lush and full look even as other annuals fade. Use them in hanging baskets or containers to create some instant autumn charm.
• Ornamental Peppers
  For gardeners craving something a little different, ornamental peppers deliver bold texture and color for fall gardens. Their vibrant fruits—ranging from purple to bright orange—add a playful, festive touch that pairs beautifully with pumpkins and gourds. They’re compact and thrive in pots, making them easy to tuck into entryways or mix into fall displays. Though edible, their hot taste is best left for show, not the kitchen.
• Asters
  Asters bloom right when the garden needs them most—late in the season when many flowers are done. Their starry purple, blue, and pink petals attract pollinators, extending food sources for bees and butterflies into fall. They’re especially-striking when paired with mums and/or ornamental grasses. Asters bring a delicate yet wild beauty, softening garden edges with a natural, meadow-like look.

 

• Ornamental Cabbage and Kale
  Few plants scream “fall charm” like ornamental cabbage and kale. Their ruffled leaves swirl in shades of purple, white, and green, providing bold texture long after the flowers fade. They can withstand Pennsylvania’s chilly nights, often looking their best after a light frost. Perfect in containers, borders, or tucked among mums, these leafy beauties are as striking as any bloom.
• Strawflowers
  Strawflowers feature papery petals that almost feel like they’ve been dried already. Blooming in bright shades of yellow, orange, pink, and red, they thrive in sunny spots and add long-lasting color when other annuals are slowing down. They’re also fantastic for cutting and drying, letting you enjoy their cheerful hues in the winter. These plants bridge the gap between summer brightness and autumn coziness quite seamlessly.

 

Tips for Planting Fall Annuals

• Prepare the Soil Well
  Fall annuals need healthy, well-draining soil to perform at their best. Mix in compost or organic matter to enrich the ground and give roots a boost. Looser soil not only promotes growth but also helps with water absorption, which is crucial as fall weather brings irregular rain. Good soil preparation ensures vibrant blooms that don’t fizzle out too early.
• Water Wisely
  Even though fall is cooler, your annuals still need consistent moisture, especially when first planted. Water deeply at the base to encourage roots to grow downward rather than staying shallow. Once established, most fall annuals can handle occasional dry spells, but avoid letting the soil completely dry out. Morning watering is best, as it gives plants time to dry before the cooler night air sets in.
• Use Containers for Flexibility
  Fall weather in Pennsylvania can be unpredictable, and containers give you options! Planting annuals in pots or window boxes lets you move them to sunnier spots, protect them from early frosts, or cluster them for an instant seasonal display. Container gardening also makes it easier to refresh tired summer plants with colorful fall replacements. A few strategically placed pots can instantly transform your patio or porch into a true autumn showpiece.

 

Planting Fall Annuals vs. Summer Annuals: Is There Any Difference? 

Planting fall annuals isn’t too different from spring planting, but Pennsylvania’s seasonal conditions require a few adjustments. Because soil temperatures are already cooling, it’s essential to loosen the ground deeply and amend it with compost before planting, ensuring roots settle in quickly. Space the plants slightly closer together than you would in the summer; this creates a fuller look and helps insulate the soil against sudden chills. 

Mulching around the base can also regulate soil temperature and retain moisture, something less necessary during summer planting. By tailoring your planting techniques to fall’s shorter days and cooler nights, your annuals will thrive until the season’s close.

When to Plant Fall Annuals

As long as conditions are not too hot, you can plant in late August, through the month of September, and even into early October. The sooner you plant them in the fall, the longer you can enjoy these unique seasonal favorites. 

If you are looking to plant fall annual flowers, don’t hesitate to visit our garden center in person. You’ll discover our full selection of seasonal plants perfectly-suited for Glenside, Pennsylvania.