Heat-Tolerant Blooms That Last All Season
Summer Flowers at Goebbert’s Farm & Garden Center
Every July, we get the same conversation at Goebbert’s Farm & Garden Center. A customer from Schaumburg or Arlington Heights walks in looking frustrated, saying something like “everything I planted in May looked great for a month, then fried.” We get it. Illinois summers are brutal on flowers: 90-degree afternoons, clay soil that bakes hard as a brick, and those wicked dry stretches in August. The good news? There are plenty of flowers that bloom all summer and actually love that heat.
The trick is picking varieties that were bred for this kind of weather from the start. We stock a whole lineup of heat-tolerant annuals and perennials that keep blooming from June through frost, even when your lawn turns crunchy.
What Makes a Flower “Heat Tolerant”?
Not every flower can handle our zone 5b/6a summers. Heat-tolerant flowers share a few traits: deep root systems that find moisture, thick or waxy leaves that resist wilting, and genetics bred for high-temp performance. Some are native to hotter climates (lantana is originally from the tropics), and some are modern hybrids developed specifically to bloom through heat waves.
Our resident expert, Ryan Smith, says most folks pick flowers based on the pretty picture on the tag without checking the heat rating. “Read the tag. If it says ‘cool season’ or ‘prefers cool nights,’ skip it for summer bedding. You want heat lovers: plants that perform when it’s hot, not despite it.”
☀️ Key Takeaways
- Heat-tolerant flowers keep blooming June through frost in Illinois zone 5b/6a.
- Top performers include Lantana, Calibrachoa, Angelonia, and SunPatiens.
- Plant in spring so roots establish before the heat hits.
- Mulch deeply, water less often, and watch for clay soil issues.
The Best Heat-Tolerant Flowers We Sell
Here’s where we focus: the summer heroes. These are the annuals and perennials we see come back year after year because they actually deliver.
Lantana
The Ultimate Heat Lover
Lantana is probably the most bulletproof heat-tolerant flower we carry. Clusters of tiny flowers in orange, yellow, pink, red, or multi-color combinations. Loves full sun, handles drought once established, and butterflies go nuts for it. Plant it in a hot spot where nothing else will survive and it’ll reward you with blooms from June through first frost.
A couple from Hoffman Estates planted lantana in their south-facing foundation bed last year: one of those spots that hits 100-plus degrees. They came back in August and told us it was the only thing still blooming on the block.
Calibrachoa
Million Bells of Nonstop Color
Calibrachoa looks like a mini petunia but way tougher. They bloom continuously without deadheading, which is huge for busy people. Great for hanging baskets, containers, and the front of borders. Full sun, regular water, and they’ll cover themselves in tiny flowers all summer.
We carry these in every color imaginable: solids, bicolors, even a “Superbells” series with unique patterns.
Angelonia
Summer Snapdragon
Angelonia, sometimes called summer snapdragon, is an underrated workhorse. Upright spikes of purple, pink, or white flowers that laugh at heat and humidity. Perfect for middle-of-the-border planting or containers where you need some vertical interest.
Deer tend to leave it alone too, which is a big plus for our customers in the more rural parts of Barrington and Algonquin.
Other Summer Workhorses We Stock
Our full-sun annual selection runs deep. Here are a few more to know about:
- Supertunia / Wave Petunia: Bred for heat. Unlike regular petunias, these keep blooming through July and August without getting leggy. More about petunias.
- Zinnias: Cut-and-come-again flowers, butterfly magnets, and rock-solid in heat. Our zinnia page has the full rundown.
- Geraniums: Classic for a reason. Heat-tolerant and drought-tolerant once established. More about geraniums.
- Vinca (Catharanthus). If something is still blooming in your neighbor’s yard in late August, there’s a good chance it’s vinca.
- Sweet Potato Vine: Chartreuse and purple foliage varieties add color all summer with zero fuss.
- Scaevola (Fan Flower): Blue or white fan-shaped flowers that spill beautifully over pot edges.
- Verbena: Low-growing, spreading, blooms forever in the heat.
- Moss Roses (Portulaca): Succulent leaves, jewel-toned flowers, thrives in the worst dry spots.
Heat-Tolerant Perennials That Come Back Every Year
Tired of replanting every spring? Perennials are the move. These come back year after year and handle Illinois summers like champs.
1. Coneflower (Echinacea)
Prairie native, butterflies love it, blooms July through September.
2. Black-Eyed Susan (Rudbeckia)
Golden yellow flowers from midsummer all the way to first frost.
3. Russian Sage (Perovskia)
Silvery foliage, purple-blue flower spikes, deer-resistant, low-water.
4. Sedum
Drought-tolerant succulent, fall bloomer, ridiculously low maintenance. See our sedum page for care details.
5. Yarrow (Achillea)
Ferny foliage with flat flower clusters in yellow, pink, or white. Tough as nails.
6. Salvia
Bee and hummingbird magnet. Long bloomer in purple, blue, pink, and red.
7. Blanket Flower (Gaillardia)
Red and yellow daisy-like flowers. Heat-proof and absolutely thrives in full sun.
8. Coreopsis (Tickseed)
Cheerful yellow flowers that just keep coming through the hottest months.
9. Speedwell (Veronica)
Spikes of blue, pink, or white flowers. Long-blooming, pollinator-friendly.
For more, browse our full Perennials section.
Why Heat-Tolerant Flowers Still Die Sometimes
Even the toughest flower can fail in Illinois summer. Our resident expert, Ben Goebbert, suggests checking a few things before blaming the plant. “When a customer tells me their heat-tolerant flower died, I ask about five things: soil, water, wind, pests, and disease. Nine times out of ten, it’s one of those and not the plant itself.”
Here are the common killers:
- Heavy clay soil: Most of the northwest suburbs sit on clay. When clay bakes in summer, water runs off instead of soaking in. Roots get parched even when your sprinkler is going. Amending with compost at planting makes a huge difference.
- Inconsistent watering: New plantings need water even if they’re drought-tolerant. “Drought-tolerant” means once established, usually after 6 to 8 weeks. Water deeply a few times a week, not a light sprinkle every day.
- Wind exposure: A lot of South Barrington and Algonquin properties sit on open ground with serious wind. Wind dries leaves out fast. If your plants are in a windy spot, mulch well and check soil moisture more often.
- Japanese beetles. These guys show up in July and can strip a lantana or zinnia in days. Hand-pick them in the morning or use an organic spray. Our perennial care blog has more pest tips.
- Powdery mildew: Shows up in humid stretches, looks like white powder on leaves. Keep foliage dry and improve air circulation.
Ben’s Rule of Five
“Soil, water, wind, pests, disease. Nine times out of ten, one of these is the real culprit. Not the flower.”
: Ben Goebbert
How to Set Heat-Tolerant Flowers Up for Success
A few tips we share with every customer who asks for flowers that bloom all summer.
1. Plant in spring, not summer
Get them in the ground in April, May, or early June so roots establish before the heat hits. Our Garden Center is well-stocked through June.
2. Mulch 2 to 3 inches deep
Keeps soil temps down and retains moisture. Don’t pile it against the stems.
3. Water deeply, less often
A good soaking twice a week beats a light spritz every day. Trains roots to go deep.
4. Feed container plants
Container flowers eat through nutrients fast. Slow-release fertilizer at planting plus a liquid feed every 2 to 3 weeks keeps them blooming hard.
5. Deadhead when you can
Removing spent blooms encourages more flowers. That said, varieties like calibrachoa and wave petunias are self-cleaning, so you can skip this step for those.
Shop Summer Flowers at Goebbert’s
We stock heat-tolerant flowers throughout spring and into summer at Goebbert’s Farm & Garden Center in Barrington. Best selection hits in April and May, and we keep restocking popular varieties like lantana, calibrachoa, and SunPatiens through June as inventory moves.
Our staff can help you pick the right flowers for your specific spot: sun exposure, soil type, container versus in-ground, deer pressure, the whole deal. Whether you’re in Barrington, South Barrington, Schaumburg, Arlington Heights, Hoffman Estates, or Algonquin, swing by and let us set you up with flowers that will still be blooming when your neighbors are dragging out the garden hose in August.
Bring Your Dream Summer Garden to Life
With over 75 years of expertise, we’re proud to be your local nursery for premium plants and personalized gardening advice. Stop by for heat-tolerant annuals like lantana, calibrachoa, angelonia, and SunPatiens, along with the perennials that keep coming back every year.
