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As the seasons transition from one to another, people move to the big question: What are the perennials that bloom all summer?

The biggest advantage of summer perennial flowers is that other than plantation, there is barely any work for you.

After you plant them on your lawn, they will offer colors and blooms that you have been missing during the warmer days.

So, for those who want the names of the perennials that bloom all summer in Ontario at breakneck speed, here is a list.

Come along for the ride as we go through the details of the summer perennial flowers!

Perennials that Bloom All Summer in Ontario

A circular diagram listing Ontario perennials that bloom all summer

Without a delay, let’s talk about the important information you need to know about the perennials that bloom all summer in Ontario:

1. Calamintha 

Dwarf calamint is a superb border edger or filler plant. From July to October, its fragrant foliage and small spikes of pale lilac flowers attract butterflies and bees. 

This is one of the perennials that bloom all summer if you give it wet and well-drained soil with partial shade or sun. 

Before planting, prepare the bed by pulling any undesired weeds down to one spade depth. 

Because they have rhizomatous roots, plant calamints 30 to 40 centimeters apart provide them enough room to thrive. 

You can plant as deeply as possible in the pot, pack down the dirt firmly, and give it plenty of water.

2. Coreopsis verticillata or Moonbeam

Though it emerges late in the spring, Thread-leaved Moonbeam Coreopsis blooms from June to September with pale yellow flowers and tiny, thread-like leaves. 

If you are looking for perennials that bloom all summer, it is a good choice.

It is exceptionally drought-tolerant, adaptable to a wide range of soil conditions, and great for mass planting. 

To help it strive, aim to divide your plant every two to three years. 

From June to September, it has pale yellow flowers with a darker center. 

Its compact form and fluffy, fern-like foliage make it ideal for growing at the front of sunny borders or as part of a container display. 

Hoverflies and butterflies are among the pollinators that will come to your lawn in search of the open flowers.

You need to deadhead the flowers to encourage new and reblooms. Apart from this, you won’t need to stress about a lot of things. For instance, they are somewhat pest and disease-free.

3. White Swan Coneflower 

Coneflowers enjoy full sun but can also grow in partial shade; they only need sufficient drainage. 

They draw butterflies and birds and can withstand droughts. July to September is when they blossom. 

Deadheading will make the bloom last longer. Over the winter, birds will be drawn to any leftover seed heads. 

The White Swan flower is unique; it has white petals that fall around a center cone that is tinted greenish-brown. 

The water needs of coneflowers might change based on the location. Coneflowers are one of the perennials that bloom all summer and demand moderate water for optimal growth and flowering. 

Let the soil dry out between applications of water. During hot or dry conditions, water more often.

Coneflower thrives when given little to no additional fertilizer. Every spring, a small layer of compost is spread around the base of plants.

To extend the bloom, reduce dead growth in late winter or early spring before plants emerge from dormancy.

If you want to know how fertilizers work, here is a detailed blog that explains fertilizer numbers.

4. Sea Holly

Eryngium planum has lengthy, spiky blue bracts surrounding a center cone, this plant produces a visually spectacular flower. It needs full sun and dry, sandy soil. 

These are the perennials that bloom all summer from June through August. 

Growing Eryngium plants is simple. All species will grow in full sun and wet soil with adequate drainage. In fact, they favor sandy soils. 

The plant, on the other hand, can endure poor soil conditions and dryness thanks to its extensive taproot. 

Because sea hollies have a taproot, they are difficult to transplant. Place young plants in holes that are a few inches wider and deeper than their existing root system. 

Seeds can be sown directly in the garden, although they may not blossom in the first year. 

The seeds require one month of warm, moist stratification, followed by one month of cold, moist stratification.

Because of their taproots, plants dislike being moved. When the seed heads turn brown in the fall, plants should be removed. Over the winter, leave the evergreen rosette of greenery at the base of the plant. 

5. Hardy Geranium

Gorgeous violet-blue blooms can be in partial shade or full sun from late June till frost. G. “Rozanne” needs soil that is well-drained and medium to moist. 

Huge, luminous violet-blue, saucer-shaped blooms with prominent white eyes and reddish-purple veining rise above mounds of deep green foliage.

Geranium ‘Rozanne’ is one of the garden’s longest-blooming summer perennial flowers. 

It is an extraordinarily free-flowering cultivar since its flowers are sterile; the blooms appear from late spring to mid-fall.

If you select these summer perennial flowers, allow lots of space to develop this sprawling perennial. 

In one season, a single robust plant may cover a 2-3 square foot area. It looks particularly great when paired with yellow or chartreuse flowers.

Hardy geraniums are excellent filler plants for any residential or commercial landscape. 

They combine well with most other perennials that bloom all summer in Ontario and provide constant color throughout the summer.

These summer perennial flowers perform nicely in containers, borders, and as an edging plant. It blooms even in the absence of deadheading. 

6. Heliopsis helianthoides or Lorraine Sunshine

This plant blooms yellow daisy flowers from June to October and has lovely variegated foliage that is green and white throughout the season. 

Loraine Sunshine False Sunflower is a herbaceous perennial that grows straight and spreads out. 

Its medium texture fits into the environment, but it can always be balanced with a few finer or coarser plants to create an attractive composition.

These perennials that bloom all summer require little maintenance and are best cleaned up in early spring before they continue active development for the season. 

It should be planted with low-growing perennials. The flower stems might be fragile, necessitating staking in exposed areas or extremely rich soils. It grows quickly and, under optimum conditions, may survive for around ten years.

Loraine Sunshine False Sunflower matures to be around 32 inches tall with a 3-foot spread. When planted in large groups or as a bedding plant, individual plants should be spaced around 30 inches apart. 

7. Hemerocallis or Day Lily 

This is another great candidate from the list of perennials that bloom all summer in Ontario.

This is one of the more recent varieties of daylilies, bred to bloom for at least 42 days, from late June to mid-July, double the average bloom duration, along with excellent foliage and strong disease resistance. 

It has big, bright yellow flowers with ruffles that will add a pop of color to your lawn.

This plant prefers full sun to moderate shade. It is quite adaptable to both dry and damp environments and should perform well in regular garden settings. 

As a plus point, it is not picky about soil type or pH. It is extremely tolerant to urban pollutants and may even thrive in inner-city situations.

It’s rather delicate texture distinguishes it from other garden plants with less polished leaves.

This plant requires little maintenance, and it is best to clean it up in early spring before it continues active development for the season.  

Daylilies can withstand a wide range of weather conditions, although they require rich, moist soil. 

8. Andersoniana/Spiderwort/Concord Grape

These are the perennials that bloom all summer and produce a visually appealing cluster of vibrant purple blooms on top of blue-green grassy foliage. 

Many of these plants have blooms that open in the morning and shut if exposed to afternoon sunlight. 

They may stay open for a longer amount of time if the weather is overcast, or into the evening. 

The leaves are strap-like and range in length from 12″ to 18″. The blooms are three-part, with spidery hair on the stamens.

Spiderwort blooms for a long time during the summer. Deadheading spent flowers helps to lengthen the bloom time. 

When planted in hot summer climates, the foliage deteriorates, and flowering may cease entirely. 

Cutting to the ground will let the plant develop fresh leaves and perhaps a late summer/fall bloom.

It grows best in moist, well-drained soil and does well in both full and partial shade. 

After flowering, trim the plant with these summer perennial flowers to maintain the plant’s appearance and promote more blooming. 

FAQs

What are some perennials that bloom all summer in Canada?

Perennials growing in full sun need at least six hours of direct sunshine per day to bloom throughout the summer. These are examples: Black-Eyed Susans, Daylilies, Coneflower, and Russian Sage.

What are the best perennials that bloom all summer?

There are many beautiful perennials that bloom all summer, such as Shasta Daisy, Salvia, Lavender, and Geranium’ Rozanne’.

What are low-growing perennials that bloom all summer?

Some of the low-growing perennials that bloom all summer are Creeping Thyme, Sedum, Lamb’s Ear, and Creeping Phlox.

Which perennials in Zone 3 bloom all summer long?

Perennials in Zone 3 can bloom all summer long and are robust enough to survive the harsh winters. Examples include Astilbe, Bee balm, Yarrow, and Blanket flowers.

What are some summertime perennials with extended blooms?

The popular choices for summertime perennials with extended bloom are Verbena, Gaura, and Penstemon. 

In Conclusion

After this long ride, we hope that you have chosen your favorites from the list of perennials that bloom all summer in Ontario.

The names in this blog include the versatile summer perennial flowers that are lauded for their colorful blooms by inexperienced and professional gardeners.

These are all amazing options to fill up empty spaces in border gardens and create beautiful flower arrangements.

For more tips and ideas on landscaping, contact us today.