Massachusetts gardeners use August to plant flowers that will establish roots before autumn’s cooler weather. The best flowers to plant in august in massachusetts are those that thrive in late-summer heat and bloom well into fall. This timing gives perennials a head start for next spring and lets annuals shine before the first frost.
August planting works because soil is warm, which speeds up root growth. You avoid the stress of midsummer heat on new transplants. Plus, nurseries often have sales on remaining stock. Let’s look at what to plant now for a colorful garden through October.
Best Flowers To Plant In August In Massachusetts
These flowers handle Massachusetts’s August conditions well. They tolerate humidity, occasional drought, and the shorter days ahead. Most will bloom from late August through September or even October.
Chrysanthemums
Mums are the classic fall flower. Plant them in August for strong root systems before cold weather. They come in many colors: yellow, bronze, red, purple, and white.
- Choose compact, bushy plants with many buds
- Water deeply twice a week until established
- Pinch back tips in early August for fuller plants
- Mulch around bases to retain moisture
Mums need full sun (6+ hours daily). They prefer well-drained soil. Avoid planting too deep—the crown should sit at soil level. Hardy mums survive Massachusetts winters if planted early enough.
Sedum
Sedum, also called stonecrop, is drought-tolerant and low-maintenance. It thrives in poor soil and full sun. Varieties like ‘Autumn Joy’ bloom pink to bronze in late summer.
- Plant in well-draining soil
- Space 12–18 inches apart
- Water only during dry spells
- Cut back spent flowers in spring
Sedum attracts butterflies and bees. It works well in rock gardens, borders, or containers. The fleshy leaves store water, so overwatering causes rot.
Asters
Asters provide late-season color with daisy-like flowers. New England asters are native to Massachusetts and support local pollinators. They bloom in purple, pink, blue, and white.
- Plant in full sun to partial shade
- Water regularly the first month
- Stake tall varieties to prevent flopping
- Divide every 2–3 years in spring
Asters pair well with ornamental grasses and goldenrod. They bloom from August until frost. Cut back by half in early July for bushier growth.
Goldenrod
Goldenrod is often blamed for hay fever, but ragweed is the real culprit. This native plant produces bright yellow plumes that butterflies love. It’s tough and adaptable.
- Plant in full sun
- Tolerates clay or sandy soil
- Water only during extended drought
- Cut back after flowering to prevent self-seeding
Goldenrod spreads quickly, so give it room. Use it in meadow gardens or naturalized areas. It blooms from August through October.
Black-Eyed Susans
These cheerful yellow daisies with dark centers bloom from midsummer to fall. They’re drought-tolerant and deer-resistant. Plant them in August for strong roots.
- Full sun is best
- Space 12–18 inches apart
- Water weekly until established
- Deadhead spent blooms for more flowers
Black-eyed Susans self-seed readily. They look great in drifts or mixed borders. Cut back stems in late fall or early spring.
Pansies
Pansies love cool weather. Plant them in late August for fall color that lasts until snow. They tolerate light frosts and often survive mild winters.
- Choose compact, well-rooted plants
- Plant in rich, well-drained soil
- Water regularly, especially in dry spells
- Fertilize with a balanced liquid feed every 2 weeks
Pansies come in many colors: purple, yellow, white, orange, and blue. They work well in containers, window boxes, or borders. Remove faded flowers to encourage more blooms.
Ornamental Kale And Cabbage
These plants add texture and color to fall gardens. Their rosettes of purple, pink, or white foliage intensify with cooler weather. Plant in August for best color.
- Full sun to partial shade
- Space 12–18 inches apart
- Water at the base to avoid leaf rot
- Protect from cabbage worms with row covers
Ornamental kale and cabbage are edible but bitter. Use them in beds, borders, or containers. They last through hard frosts.
Snapdragons
Snapdragons tolerate light frost and bloom into fall. Plant them in August for a second flush of flowers. They come in tall, medium, and dwarf varieties.
- Full sun to partial shade
- Well-drained soil
- Water at the base to prevent mildew
- Deadhead regularly for continuous bloom
Snapdragons attract hummingbirds. They work well as cut flowers. Tall varieties may need staking.
Dianthus
Dianthus, or pinks, have fragrant flowers in pink, red, white, and purple. Many varieties bloom from spring to fall. Plant in August for late-season color.
- Full sun
- Well-drained, slightly alkaline soil
- Water moderately
- Deadhead spent flowers
Dianthus is deer-resistant. It works well in rock gardens, borders, or containers. Shear back after first bloom for reblooming.
Planting Tips For August In Massachusetts
August planting requires some adjustments. The heat can stress new plants. Follow these steps for success.
Prepare The Soil
Loosen soil to 8–10 inches deep. Mix in 2–3 inches of compost or aged manure. This improves drainage and adds nutrients. Test soil pH if possible—most flowers prefer 6.0–7.0.
Water Correctly
Water deeply and less often. This encourages deep root growth. Water in the morning to reduce evaporation and prevent disease. Use soaker hoses or drip irrigation for efficiency.
- New plants: water every 2–3 days for 2 weeks
- Established plants: water once a week if no rain
- Check soil moisture 2 inches deep before watering
Mulch To Conserve Moisture
Apply 2–3 inches of organic mulch like shredded bark or straw. Mulch keeps soil cool, retains moisture, and suppresses weeds. Keep mulch away from plant stems to prevent rot.
Fertilize Lightly
Use a balanced, slow-release fertilizer at planting time. Avoid high-nitrogen fertilizers that promote leaf growth over flowers. Follow package rates for your plant type.
Monitor For Pests
August heat brings pests like aphids, spider mites, and Japanese beetles. Check plants weekly. Use insecticidal soap for soft-bodied pests. Hand-pick beetles into soapy water.
Regional Considerations For Massachusetts
Massachusetts has varied climates. Coastal areas near Boston have milder winters. Western parts like the Berkshires get colder earlier. Adjust planting times accordingly.
Coastal Massachusetts (Zones 6B–7a)
These areas have longer growing seasons. You can plant later in August. Salt-tolerant plants like sea thrift and beach rose work well. Protect plants from salt spray.
Central Massachusetts (Zones 5B–6a)
This region has moderate winters. Plant by mid-August for best results. Choose hardy varieties that establish before frost. Mulch heavily for winter protection.
Western Massachusetts (Zones 5A–5b)
Higher elevations mean earlier frosts. Plant in early August. Use cold-tolerant plants like pansies and ornamental kale. Consider using row covers for extra protection.
Benefits Of August Planting
Planting in August offers several advantages. The warm soil speeds root growth. Plants face less transplant shock than in summer heat. You get color when many gardens fade.
- Stronger root systems by winter
- Earlier blooms next spring for perennials
- Less watering needed than spring planting
- Nursery sales on remaining stock
- Extended garden color into fall
Common Mistakes To Avoid
August planting has pitfalls. Avoid these common errors.
- Planting too deep—crowns rot in wet soil
- Overwatering—causes root rot and fungus
- Ignoring spacing—crowded plants compete for resources
- Skipping mulch—soil dries out fast in August heat
- Planting tender varieties too late—they won’t establish before frost
Companion Planting Ideas
Combine flowers for better growth and pest control. These pairings work well in Massachusetts gardens.
- Mums with ornamental grasses for texture
- Asters with goldenrod for native pollinator support
- Pansies with ornamental kale for color contrast
- Sedum with black-eyed Susans for drought tolerance
- Snapdragons with dianthus for continuous bloom
Container Gardening For August
Containers offer flexibility. Move them to catch sun or shade. Use large pots (12+ inches) to reduce watering frequency.
- Choose pots with drainage holes
- Use quality potting mix, not garden soil
- Add slow-release fertilizer at planting
- Water daily in hot weather
- Group pots together to retain moisture
Good container choices for August: pansies, ornamental kale, snapdragons, and dianthus. Combine trailing plants like ivy for fullness.
Fall Cleanup And Winter Preparation
August-planted flowers need care as fall approaches. Prepare them for winter dormancy.
- Reduce watering in September as temperatures drop
- Stop fertilizing by mid-September
- Leave spent flowers for winter interest and bird food
- Cut back dead foliage in spring, not fall
- Apply extra mulch after ground freezes
Frequently Asked Questions
What flowers can I plant in August in Massachusetts?
You can plant chrysanthemums, sedum, asters, goldenrod, black-eyed Susans, pansies, ornamental kale, snapdragons, and dianthus. These tolerate late-summer heat and bloom into fall.
Is it too late to plant flowers in August in Massachusetts?
No, August is ideal for many flowers. The warm soil promotes root growth. Perennials establish before winter, and annuals bloom until frost. Plant by mid-August for best results.
Can I plant perennials in August in Massachusetts?
Yes, perennials like sedum, asters, and black-eyed Susans do well when planted in August. They develop strong roots before winter and bloom earlier next spring.
What annuals can I plant in August in Massachusetts?
Pansies, snapdragons, and dianthus are good annual choices. They tolerate cool weather and bloom into fall. Ornamental kale and cabbage provide color through winter.
How often should I water flowers planted in August?
Water new plants every 2–3 days for the first two weeks. Then reduce to once a week if there’s no rain. Check soil moisture 2 inches deep before watering.
Final Thoughts
August planting gives your Massachusetts garden a second wind. The best flowers to plant in august in massachusetts combine beauty with toughness. They handle our late-summer heat and transition gracefully into fall.
Start with a few varieties that match your garden’s light and soil. Water consistently, mulch well, and watch for pests. Your efforts will reward you with color through September and beyond.
Remember to check your local frost dates. Coastal areas have more time than western regions. Adjust your planting schedule accordingly. With proper care, your August-planted flowers will thrive and bring joy for months.