Kentucky’s fertile soil and warm August evenings support a wide range of late-summer bloomers. If you’re searching for the best flowers to plant in august in kentucky, you’ve come to the right place. August might seem late, but it’s actually a prime window for establishing flowers that thrive in the heat and bloom into fall. This guide covers the top choices, planting tips, and care strategies to keep your Kentucky garden colorful through September and beyond.
August in Kentucky brings long, hot days and occasional thunderstorms. The soil is warm, which helps roots establish quickly. You want flowers that can handle humidity and still put on a show. Let’s get straight to the list.
Best Flowers To Plant In August In Kentucky
These flowers are proven winners for late-summer planting in the Bluegrass State. They tolerate heat, attract pollinators, and bloom until the first frost.
Marigolds
Marigolds are tough, cheerful, and easy to grow. They come in shades of yellow, orange, and red. Plant them from seed or transplants in August for continuous blooms through October.
- Sunlight: Full sun
- Soil: Well-drained, average fertility
- Water: Keep soil moist until established, then water weekly
- Spacing: 6-12 inches apart depending on variety
Marigolds also repel some garden pests, making them great companions for vegetables.
Zinnias
Zinnias are a Kentucky favorite for late-summer color. They bloom profusely and attract butterflies. Sow seeds directly in the ground in August for flowers in about 6-8 weeks.
- Sunlight: Full sun
- Soil: Rich, well-drained
- Water: Water at the base to avoid mildew
- Spacing: 8-12 inches apart
Deadhead spent blooms to encourage more flowers. Zinnias make excellent cut flowers too.
Cosmos
Cosmos are airy, delicate-looking flowers that are surprisingly heat-tolerant. They grow quickly from seed and bloom until frost. Their daisy-like flowers come in pink, white, and burgundy.
- Sunlight: Full sun
- Soil: Poor to average, well-drained
- Water: Drought-tolerant once established
- Spacing: 12-18 inches apart
Cosmos self-seed readily, so you might get volunteers next year.
Sunflowers
Sunflowers are iconic for late summer. Choose fast-maturing varieties like ‘Sunspot’ or ‘Teddy Bear’ that bloom in 50-60 days. Plant seeds directly in August for September flowers.
- Sunlight: Full sun
- Soil: Deep, well-drained
- Water: Regular watering during germination
- Spacing: 6-24 inches depending on variety
Sunflowers attract birds and bees. Leave the seed heads for wildlife after blooming.
Celosia
Celosia, also called cockscomb, has unique, velvety blooms in red, yellow, pink, and orange. It thrives in Kentucky’s August heat and adds texture to gardens.
- Sunlight: Full sun
- Soil: Rich, moist, well-drained
- Water: Keep evenly moist
- Spacing: 8-12 inches apart
Celosia works well in containers or borders. Its flowers last a long time, even when cut.
Salvia
Salvia, or sage, produces spikes of blue, purple, red, or white flowers. It’s a magnet for hummingbirds and butterflies. Plant transplants in August for fall color.
- Sunlight: Full sun to partial shade
- Soil: Well-drained, slightly alkaline
- Water: Moderate, let soil dry between waterings
- Spacing: 12-18 inches apart
Salvia is deer-resistant and low-maintenance.
Petunias
Petunias are classic annuals that bloom from spring until frost. August-planted petunias will flower into October if you keep them deadheaded. Choose heat-tolerant varieties.
- Sunlight: Full sun
- Soil: Rich, well-drained
- Water: Water regularly, especially in containers
- Spacing: 10-12 inches apart
Petunias come in many colors and patterns. They’re great for hanging baskets.
Lantana
Lantana is a heat-loving perennial in Kentucky (often grown as an annual). It produces clusters of yellow, orange, pink, or red flowers. It blooms non-stop until frost.
- Sunlight: Full sun
- Soil: Well-drained, tolerates poor soil
- Water: Drought-tolerant once established
- Spacing: 12-18 inches apart
Lantana attracts butterflies and is very low-maintenance.
Portulaca
Portulaca, or moss rose, is a succulent ground cover with bright, rose-like flowers. It thrives in heat and poor soil. Plant seeds or transplants in August.
- Sunlight: Full sun
- Soil: Sandy, well-drained
- Water: Very drought-tolerant
- Spacing: 6-8 inches apart
Portulaca flowers close at night and on cloudy days. It’s perfect for rock gardens.
Cleome
Cleome, or spider flower, has tall stems topped with airy clusters of pink, white, or purple flowers. It’s heat-tolerant and self-seeds readily.
- Sunlight: Full sun
- Soil: Average, well-drained
- Water: Moderate, drought-tolerant once established
- Spacing: 12-18 inches apart
Cleome adds height and drama to the back of borders.
How To Plant Flowers In August In Kentucky
August planting requires a few extra steps due to heat. Follow these tips for success.
Prepare The Soil
Kentucky soil can be heavy clay. Amend it with compost or aged manure to improve drainage and fertility. Work the soil to a depth of 8-10 inches.
- Remove weeds and rocks.
- Spread 2-3 inches of compost.
- Mix it into the soil thoroughly.
- Rake the bed smooth.
Watering Strategy
August heat means you need to water deeply and consistently. Water in the morning to reduce evaporation and prevent disease.
- New transplants: Water daily for the first week.
- Seeds: Keep soil moist until germination.
- Established plants: Water 1-2 inches per week.
Mulching
Apply a 2-3 inch layer of organic mulch around plants. This keeps soil cool, retains moisture, and suppresses weeds.
- Use shredded bark, straw, or grass clippings.
- Keep mulch away from plant stems.
- Replenish as needed.
Fertilizing
Most flowers benefit from a balanced fertilizer at planting time. Use a slow-release formula or liquid fertilizer every 2-3 weeks.
- Choose a fertilizer with equal N-P-K (like 10-10-10).
- Follow package instructions.
- Avoid over-fertilizing, which can burn roots.
Best Flowers For Shade In August In Kentucky
Not every Kentucky garden gets full sun. These flowers tolerate partial shade and still bloom well in late summer.
Impatiens
Impatiens are classic shade annuals. They bloom in pink, red, white, and purple from spring until frost. Plant transplants in August for fall color.
- Sunlight: Partial to full shade
- Soil: Rich, moist, well-drained
- Water: Keep consistently moist
- Spacing: 8-10 inches apart
Begonias
Begonias have waxy leaves and clusters of pink, red, or white flowers. They thrive in shade and humidity.
- Sunlight: Partial shade
- Soil: Well-drained, rich
- Water: Moderate, avoid wetting leaves
- Spacing: 8-12 inches apart
Coleus
Coleus is grown for its colorful foliage, not flowers. It adds vibrant red, yellow, green, and purple leaves to shady spots.
- Sunlight: Partial to full shade
- Soil: Rich, moist, well-drained
- Water: Keep evenly moist
- Spacing: 10-12 inches apart
Perennials To Plant In August In Kentucky
August is also a good time to plant perennials for next year. They’ll establish roots before winter and bloom next spring.
Black-Eyed Susans
These native perennials have golden yellow petals and dark centers. They bloom from summer into fall and are very heat-tolerant.
- Sunlight: Full sun
- Soil: Average, well-drained
- Water: Drought-tolerant once established
- Spacing: 12-18 inches apart
Purple Coneflower
Echinacea is a tough perennial with pink-purple petals and a cone-shaped center. It attracts butterflies and birds.
- Sunlight: Full sun to partial shade
- Soil: Well-drained, average
- Water: Moderate, drought-tolerant
- Spacing: 12-18 inches apart
Daylilies
Daylilies are reliable perennials that bloom in summer. Plant them in August for flowers next year. They come in many colors.
- Sunlight: Full sun to partial shade
- Soil: Well-drained, adaptable
- Water: Moderate
- Spacing: 18-24 inches apart
Common Mistakes When Planting In August
Avoid these errors to keep your flowers healthy.
- Planting too deep: Bury roots at the same level as in the pot.
- Skipping mulch: Mulch is critical for moisture retention.
- Overwatering: Soggy soil causes root rot. Check soil before watering.
- Ignoring pests: Watch for aphids, spider mites, and slugs.
- Planting too late: Check your first frost date (usually mid-October in most of Kentucky).
Frequently Asked Questions
Can I plant flowers in August in Kentucky?
Yes, August is an excellent time to plant many annuals and perennials. The warm soil helps roots establish quickly, and flowers bloom until the first frost.
What flowers bloom in August in Kentucky?
Marigolds, zinnias, cosmos, sunflowers, celosia, salvia, petunias, lantana, portulaca, and cleome all bloom in August. Many continue into fall.
Is it too late to plant flowers in August?
No, it’s not too late. Choose fast-growing annuals or perennials that will establish before winter. Avoid plants that need a long growing season.
What are the best flowers for full sun in Kentucky in August?
Zinnias, marigolds, sunflowers, lantana, portulaca, and cosmos are top choices for full sun. They thrive in heat and bloom profusely.
How often should I water flowers planted in August?
Water new transplants daily for the first week, then reduce to 1-2 inches per week. Seeds need consistent moisture until they sprout. Always water in the morning.
Final Tips For August Planting Success
Kentucky’s August weather can be unpredictable. Here are a few extra pointers.
- Check the forecast: Avoid planting during a heatwave. Plant on a cooler day or in the evening.
- Harden off transplants: If you buy plants from a greenhouse, acclimate them to outdoor sun over a few days.
- Deadhead regularly: Removing spent flowers encourages more blooms.
- Watch for disease: Humidity can cause powdery mildew. Space plants for air circulation.
- Enjoy the process: August gardening is rewarding. You’ll have color until the leaves fall.
With these flowers and tips, your Kentucky garden will stay vibrant through late summer and into autumn. Pick a few favorites, prepare your soil, and get planting. The warm August days are perfect for growing something beautiful.