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Yes, you can plant perennials in August in much of the United States, but there is a catch: use container-grown plants, divisions, or mature nursery starts if you want blooms this fall. Seed packets started in August are usually a next-year project, not a fast route to fall color.
August planting works because the soil is warm, which helps roots grow quickly. The hard parts are heat stress, dry soil, short timing before frost in northern states, and poor bed preparation. On our job sites, we treat late-summer perennial planting more like a small landscape installation than a casual weekend drop-in. The plants need the right exposure, drainage, mulch depth, watering plan, and spacing from foundations and hardscape.
The 12 perennials below are common, widely available, and practical for homeowners who want more blooms through fall: coneflower, black-eyed Susan, aster, sedum, salvia, coreopsis, catmint, yarrow, garden phlox, hardy mums, Japanese anemone, and reblooming daylilies. Some can bloom again this year from nursery plants. Others are worth planting in August because they establish now and come back stronger next season.
Before You Buy: The August Planting Rules That Matter
Start with your USDA Plant Hardiness Zone. The current standard is the 2023 USDA Plant Hardiness Zone Map, which uses 30-year average annual extreme minimum temperatures. Zones are shown in 10-degree Fahrenheit bands, with 5-degree half-zones. That zone tells you whether a perennial is likely to survive winter, but it does not tell the whole story. Sun exposure, drainage, summer heat, irrigation limits, and first frost date matter just as much in August.
In colder areas of the Upper Midwest, Northeast, mountain states, and northern Plains, try to plant at least 4 to 6 weeks before your average first hard frost. In many northern markets, that makes early to mid-August much safer than late September. In the South, Gulf Coast, Southwest, and lower-elevation West, frost is not the immediate problem. Heat, drought, and water restrictions are.
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For best results, buy healthy 1-gallon or larger nursery plants, not dried-out bargain plants with circling roots and brittle stems. Plant on a cloudy day or in late afternoon. Water the root ball before planting, set the crown at the same height it was in the pot, and mulch with 2 to 3 inches of organic mulch. Keep mulch pulled back from stems and crowns by about 2 inches so you do not trap rot against the plant.
Established perennial beds often need about 1 inch of water per week, but new August plantings need more frequent checks. For the first 2 weeks, check soil moisture every 1 to 2 days. The goal is evenly damp soil around the root zone, not mud. Drip irrigation or soaker hose is better than overhead watering, especially for phlox, asters, and black-eyed Susan, because wet foliage raises disease pressure.
Quick Comparison: 12 Perennials Worth Planting in August
| Perennial | Best Site | Fall Bloom Potential From Nursery Starts | Typical Use |
|---|---|---|---|
| Coneflower | Full sun, average to dry soil | Moderate | Pollinator bed, meadow-style border |
| Black-eyed Susan | Full sun, average soil | High | Bright late-summer color |
| Aster | Full sun, average soil | High | Late fall color, pollinators |
| Sedum | Full sun, dry to average soil | High | Low-water structure |
| Salvia | Full sun, well-drained soil | Moderate to high after shearing | Repeat bloom, edging |
| Coreopsis | Full sun, average soil | Moderate to high after deadheading | Long-blooming yellow accents |
| Catmint | Full sun, dry to average soil | Moderate after cutting back | Soft edging, drought tolerance |
| Yarrow | Full sun, lean well-drained soil | Moderate after deadheading | Dry slopes, pollinator plantings |
| Garden phlox | Sun to part shade, moist soil | Moderate to high | Fragrant summer-to-fall color |
| Hardy mums | Full sun, well-drained soil | Very high | Instant fall impact |
| Japanese anemone | Part shade, moist rich soil | High where established in pots | Shade-edge fall flowers |
| Reblooming daylily | Full sun to light shade | Moderate in long seasons | Reliable foundation and border plant |
1. Coneflower
Coneflower is one of the most useful August perennials because it handles sun, heat, and average soil once established. Nursery plants may continue blooming into fall, especially if they are not completely exhausted when purchased. Expect 18 to 36 inches of height depending on the cultivar.
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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchPlant coneflower in full sun with 18 to 24 inches between plants. It pairs well with black-eyed Susan, yarrow, sedum, and ornamental grasses. Do not overwater it after establishment. Coneflower prefers soil that drains, and heavy wet clay can shorten its life.
If flowers fade, leave some seedheads standing. They add winter texture and provide food for birds. In a front-yard bed, we usually deadhead the messiest stems but leave a controlled number of seedheads so the bed looks intentional.
2. Black-Eyed Susan
Black-eyed Susan gives homeowners fast color when August beds look tired. Container-grown plants often arrive in bloom and can carry yellow-gold flowers into early fall. Most common varieties want full sun and average soil.
Space plants about 18 inches apart for a filled-in look without crowding. Crowding is a common mistake because August plants look small at installation but expand quickly the following year. For a 30-square-foot border, 8 to 12 plants can create a strong mass without turning the bed into a maintenance problem.
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Use drip or soaker irrigation rather than spraying foliage every evening. Good airflow helps reduce leaf spots and mildew. If your site has heavy clay, amend the planting area broadly instead of dumping soft potting mix into individual holes.
3. Aster
Asters are one of the best answers for true fall bloom. They flower late, support pollinators, and look especially good with sedum because the soft aster flowers contrast with sedum’s upright structure. Most garden asters prefer full sun and average, well-drained soil.
Nursery asters planted in August can bloom that same season if watered correctly. Set plants 18 to 24 inches apart, depending on mature size. Taller varieties may need support if planted in exposed, windy locations.
Asters are worth buying before the first full flush of bloom if possible. Plants that are already completely covered in flowers can still work, but they need careful watering because the top growth is demanding a lot from a root ball that has just been disturbed.
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4. Sedum
Sedum, often sold as stonecrop, is one of the most dependable choices for hot, sunny beds. Upright sedums give you thick leaves, sturdy stems, and late-season flower heads that shift from green to pink, rose, bronze, or rust depending on the cultivar.
Plant sedum in full sun with sharp drainage. Space most upright types 18 to 24 inches apart. This is a good plant for dry corners, curb strips, and areas where irrigation is limited, but it still needs regular moisture during the first few weeks after August planting.
Do not bury the crown or pile mulch against the stems. Sedum dislikes wet crowns and heavy winter mulch. Use it where the grade drains away from the house, not where downspouts dump water into the bed.
5. Salvia
Perennial salvia earns its place because it can rebloom after shearing or deadheading, especially in full sun. It is useful along walkways, patios, and front borders because many varieties stay in the 12- to 24-inch range.
For August planting, look for compact, healthy plants with new basal growth rather than tired plants with woody, split centers. Space them 12 to 18 inches apart. Salvia needs well-drained soil and does not like sitting wet through winter.
After the first flush fades, cut spent flower spikes back. In warmer regions and long fall seasons, that can trigger another round of bloom. Pair salvia with coreopsis for a clean blue-purple and yellow combination that reads well from the street.
6. Coreopsis
Coreopsis is a long-blooming perennial that can keep producing if deadheaded. It is commonly available, cheerful without being fussy, and useful for filling sunny beds with yellow, gold, or bicolor flowers.
Plant coreopsis in full sun and average soil. Most common types need 12 to 18 inches of spacing. Avoid overly rich soil and constant overhead irrigation, which can push weak growth.
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Clear out junk files and repair common Windows errorsFree Scan →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →In August, trim off ragged flowers at planting time if the plant is stressed. That feels counterproductive, but reducing spent top growth helps the plant redirect energy into roots. A healthy nursery plant can still produce additional flowers before frost.
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- Dual-Layer Design: Constructed with a heavy duty double-layer design, combining PVC and Nylon, this hose is built to last. The flat garden hose is kink-resistant and easily navigates through rows of flowers, vegetables, or trees. The clog-resistant fabric cover with a PVC inner core allows for placement above ground or beneath mulch or soil
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7. Catmint
Catmint is a practical perimeter plant for sunny beds. It handles heat, tolerates dry soil after establishment, and produces soft blue-purple flowers that work well with sedum, coneflower, yarrow, and roses.
Use catmint where it can spill slightly without covering a walkway. Many varieties spread 24 to 36 inches wide, so spacing matters. For narrow foundation beds, choose compact cultivars and keep plants at least 18 inches off siding or trim so airflow remains open.
If the plant looks tired in August, shear it back by one-third after planting and water consistently. In many regions, it will push fresh growth and some rebloom before fall ends.
8. Yarrow
Yarrow is a tough full-sun perennial for lean, well-drained soils. It is a good fit for dry slopes, pollinator beds, and informal meadow-style plantings. Flower colors range from white and yellow to pink, red, and terracotta.
Space yarrow 18 to 24 inches apart. It does not need rich soil, and too much fertilizer can make stems floppy. If you are installing a bed near a driveway or walkway, keep mature width in mind so stems do not lean into traffic.
Deadheading can extend bloom. In winter, leave some structure standing if the bed is not in a high-visibility formal area. Cut back damaged or flattened stems during cleanup.
9. Garden Phlox
Garden phlox brings fragrant clusters of color in late summer and can continue into fall depending on cultivar and climate. It is more demanding than sedum or yarrow, but it earns its space in mixed borders and part-shade edges.
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1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsGive garden phlox sun to part shade, moist soil, and room for airflow. Space plants 18 to 24 inches apart. Overcrowding and overhead watering are the two fastest ways to create mildew problems.
On our crews, we avoid tucking phlox into tight corners against fences, walls, or dense shrubs. It performs better where air moves and irrigation reaches the soil instead of soaking the leaves. Mulch helps keep soil moisture steady, but keep mulch away from the stems.
10. Hardy Mums
Hardy mums are the fastest route to immediate fall color, but homeowners should treat the word “hardy” with some caution. Mums planted in spring have more time to establish roots before winter. Mums planted in August can survive in many areas, but they need good drainage, consistent water, and enough time before a hard freeze.
For the best chance of return, plant mums in full sun, not in a shaded porch corner. Space garden mums 18 to 24 inches apart. Avoid waterlogged soil. A mum sitting in a soggy bed against a downspout is unlikely to overwinter well.
If your main goal is a guaranteed fall display, mums are excellent. If your main goal is a perennial bed that reliably returns for years, mix mums with longer-lived perennials such as sedum, coneflower, asters, and catmint.
11. Japanese Anemone
Japanese anemone is one of the best fall-blooming choices for part shade. It produces graceful flowers on taller stems and looks especially good with garden phlox, ferns, sedges, and shade-tolerant groundcovers.
Plant it in moist, rich, well-drained soil. Many varieties reach 24 to 48 inches tall, so place them toward the middle or back of a border. Give plants 24 to 30 inches of room.
Check local guidance before planting because some ornamentals behave aggressively in certain regions. A plant that is well-behaved in one climate can spread too much in another. For any perennial that self-seeds or runs, verify it is not listed as invasive or noxious in your state.
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Daylilies are reliable workhorses for sunny beds, foundation plantings, and driveway borders. Reblooming types can produce another round of flowers where the season is long enough. In cooler zones, August planting may be more about next year’s performance than this year’s flowers.
Plant daylilies in full sun to light shade. Space most modern varieties 18 to 24 inches apart. Set the crown at the correct height and water deeply after planting. Daylilies tolerate a range of soils, but they still perform better in prepared beds than in compacted subsoil left over from construction.
Late summer is also a common time to divide established daylilies. Replant divisions promptly, water them in, and mulch lightly. Do not leave bare-root divisions baking in the sun while you finish the rest of the bed.
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Best Plant Picks by Site Condition
Full Sun and Dry Soil
Use sedum, yarrow, coneflower, and catmint. These are the right choices for curbside beds, south-facing borders, and areas that dry out quickly. They still need water while rooting, but they are more forgiving after establishment.
Full Sun and Average Soil
Use black-eyed Susan, salvia, coreopsis, asters, reblooming daylilies, and coneflower. This is the easiest category for most suburban yards. For a 6-by-10-foot bed, a good layout might include 3 sedums, 5 asters, 5 black-eyed Susans, 3 salvia, and 3 catmint, with spacing adjusted to mature size.
Moist Soil or Part Shade
Use Japanese anemone and garden phlox. These plants need better moisture management and airflow. They are good near shade edges, patios with morning sun, and beds protected from brutal afternoon heat.
Instant Fall Impact
Use hardy mums, asters, sedum, and black-eyed Susan. These are the plants to buy when you need a bed to look finished in 2 to 3 weeks, not next spring.
How to Plant August Perennials So They Survive
Start with bed preparation. Remove weeds, loosen compacted soil 8 to 12 inches deep where practical, and correct drainage before planting. If water stands in the bed for hours after rain, do not ignore it. Perennials fail quickly when roots sit in saturated soil.
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Set plants at the same depth they grew in the container. Rough up circling roots with your fingers. Backfill with native soil improved across the whole bed, then water deeply. Add 2 to 3 inches of organic mulch, keeping it off crowns and stems.
Keep grading in mind. A flower bed should not slope mulch, water, or soil toward siding, foundation vents, basement windows, crawlspace openings, or hardscape joints. Maintain several inches of visible foundation where possible, and never bury weep holes or low siding. That is the difference between landscaping and creating a moisture problem for the house.
Watering, Mulch, and Maintenance Schedule
For the first week after August planting, check moisture daily during hot weather. In sandy soil or high heat, small plants may need water every day or every other day. In clay soil, they may need less frequent but deeper watering. The root ball and surrounding soil should both be damp.
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallWeeks 2 through 4 are the adjustment period. Water deeply when the top 1 to 2 inches of soil begin to dry. After that, transition toward about 1 inch of water per week for the bed, including rainfall, while continuing to monitor new plants during heat waves.
Use dripline or soaker hose when possible. Landscape irrigation accounts for a large share of residential water use, and outdoor use is commonly around 30% of household water use. More than half of outdoor water goes to lawns and gardens, so poor irrigation design wastes money fast. Water the root zone, not the sidewalk, siding, or leaves.
Deadhead salvia, coreopsis, yarrow, coneflower, and black-eyed Susan if you want cleaner rebloom. Shear catmint if it looks open and tired. Leave sedum heads standing unless they flop. Do not fertilize heavily in late summer; pushing soft growth right before winter can reduce hardiness.
What It Costs to Install an August Perennial Bed in 2026
For DIY planting, common 1-gallon perennials often run about $8 to $15 each from budget sources and $12 to $30 or more at retail nurseries, depending on cultivar, pot size, bloom stage, region, and shipping. A modest 60-square-foot bed using 20 to 30 perennials could put plant material around $240 to $900 before soil, mulch, edging, irrigation, or tools.
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HomeGuide’s 2026 data lists flower planting at about $10 to $30 per pot or $15 to $45 per square foot for planting flowers. Labor varies widely: Lawn Love reports many landscaping companies charging about $50 to $110 per hour, while HomeAdvisor’s 2026 lawn and garden guide shows gardener hourly rates roughly from $20 to $150 depending on market and task complexity.
| Project Item | Typical 2026 Cost | Notes |
|---|---|---|
| DIY 1-gallon perennials | $8-$30+ each | Budget sources cost less; specialty cultivars and larger pots cost more. |
| Professional flower planting | $10-$30 per pot | Useful for adding plants to an existing prepared bed. |
| New flower bed installation | $1,000-$3,000 common range | Average around $2,000; often $10-$20 per square foot. |
| Flower bed weeding/prep | $23-$265 per visit | Average around $99; larger beds may price around $1.20-$2.19 per square foot. |
| Mulch installation | $30-$120 per cubic yard | Material, delivery, labor, and site access affect price. |
| Landscape labor | $50-$110 per hour common range | Complex grading, irrigation, and disposal increase labor time. |
The biggest cost drivers are bed size, turf removal, weed pressure, soil amendment needs, drainage corrections, irrigation add-ons, mature plant sizes, native or specialty cultivars, access for crews, disposal fees, and whether design is included. A clean existing bed costs much less to refresh than a compacted lawn area that needs edging, soil correction, and drainage work.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.When to DIY vs. When to Hire a Pro
DIY makes sense when the bed is small, drainage is already good, utilities are not nearby, and you are planting 10 to 30 container perennials. A homeowner with basic tools can usually handle a 40- to 80-square-foot refresh over a weekend, especially if the bed only needs weeding, light amendment, planting, and mulch.
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Hire a pro when the bed touches the house, slopes toward the foundation, needs turf removal, has irrigation problems, or requires more than a few cubic yards of soil or mulch. Also bring in help if you are changing grade, installing edging against hardscape, working near utilities, or trying to finish a large front-yard bed before an event or listing date.
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The pro advantage is not just speed. It is sequencing. Crews know to solve drainage before planting, set bed lines before mulch delivery, keep soil below siding and vents, and install plants at mature spacing instead of making the bed look full for one weekend and crowded for the next five years.
Safety, 811, HOA, and Local Rules
Call 811 before digging if you are creating a new bed, installing edging stakes, adding irrigation, planting near utility routes, or digging deeper than routine hand weeding. Utility lines can be shallower than expected, especially near meters, service entries, sidewalks, and older landscape beds. The service is there to mark public utilities before work begins.
Check HOA rules before changing a front-yard bed. Common restrictions include approved plant lists, maximum bed coverage, mulch color, edging materials, irrigation visibility, plant height near sidewalks, and requirements to replace dead plants quickly. It is easier to confirm before installation than to rebuild a finished bed.
Also check local invasive and noxious plant lists before buying aggressive ornamentals. Native and near-native choices such as Echinacea, Rudbeckia, asters, yarrow, sedum, and some phlox can improve pollinator value, but plant behavior varies by region. Buy plants that fit your state and site, not just a pretty tag at the garden center.
Common August Planting Mistakes
The first mistake is buying plants in full bloom, dropping them into hot dry soil, and assuming rainfall will establish them. Rain helps, but it does not reliably soak a nursery root ball. Hand-check the soil.
The second mistake is planting too deep. Crowns buried under soil or mulch are more likely to rot. Set the plant at container height and keep mulch off the stems.
The third mistake is crowding. A bed packed tight in August may look impressive for two weeks, then turn into a mildew-prone, high-maintenance mess next year. Follow mature spacing.
The fourth mistake is ignoring drainage against the house. A flower bed should improve the property, not push moisture toward siding, foundations, vents, or hardscape joints.
The fifth mistake is expecting seed-grown perennials to bloom immediately. If you want fall flowers this year, buy mature plants. Seeds and small plugs are mainly an investment in next season.
Final Takeaway
August is a good time to plant perennials when you choose the right plants and treat water, timing, and bed prep seriously. For the strongest fall color, use nursery-grown asters, hardy mums, sedum, black-eyed Susan, garden phlox, Japanese anemone, and reblooming daylilies where the season allows. For long-term performance, add coneflower, salvia, coreopsis, catmint, and yarrow.
The best August perennial beds are not built around one plant. They combine bloom time, mature size, texture, water needs, and site conditions. Match the plant to the exposure, keep the crown dry, water the root zone, mulch correctly, and give the bed enough room to mature. That is how a late-summer planting becomes fall color now and a stronger landscape next year.
Frequently Asked Questions
Can you plant perennials in August in the U.S.?
Yes, in many U.S. regions August is workable for container-grown perennials, divisions, and mature nursery starts. In colder zones, aim for 4 to 6 weeks before the average first hard frost. In hotter regions, plant during a cloudy stretch or late afternoon and keep water consistent.
Which perennials planted in August will bloom this fall?
The best bets from nursery starts are asters, hardy mums, sedum, black-eyed Susan, garden phlox, Japanese anemone, salvia, coreopsis, catmint, yarrow, coneflower, and reblooming daylilies in long-season areas.
How often should newly planted perennials be watered in August?
Check them daily during the first hot week, then every 1 to 2 days until they begin rooting into the surrounding soil. After establishment, many perennial beds need about 1 inch of water per week, including rainfall.
How much does it cost to install a perennial flower bed in 2026?
DIY 1-gallon perennials commonly cost about $8 to $30 or more each. Professional flower bed installation often runs $1,000 to $3,000, with many projects priced around $10 to $20 per square foot depending on prep, plants, soil, edging, mulch, labor, and drainage needs.
Do I need 811 before planting a flower bed?
Call 811 before digging for a new bed, installing edging, adding irrigation, planting near utility routes, or doing anything deeper than light surface work. Marked utilities reduce the risk of hitting buried service lines.
Are hardy mums true perennials?
Hardy mums can be perennial, but fall-planted mums are less reliable than spring-planted mums because they have less time to establish roots before winter. Plant them in full sun, well-drained soil, and water consistently for the best chance of return.
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