List of hardy perennial Flowers That Bloom All Summer

One best thing about hardy perennial flowers is that they come back every year. Unlike annuals which must be planted every year. 

Some may argue, growing different plants every year is good gardening practice. But I adore flowers that come brighter and better each year, merging with the texture of the surroundings.

If you’re interested in growing these types of plants then here you’ll get a list of hardy perennial flowers that bloom and return every year in the growing season.

So, get ready for some beauties.

Below are some perennials that are easy to grow and have exemplary characteristics that make them perfect for the garden. These flowers can grow almost anywhere in the USA or UK. For better understanding, I have also mentioned the Hardiness zone.

Balloon Flower 

Balloon flowers are especially easy to grow plants. It prefers full sun to partial shade, in organic-rich and well-drained soil. It’s found in many colors such as purple, white, pink, or blue in single or double petals varieties. Buds blossom in July and August, sow seeds in early spring in zone 3 to 8. You also increase bloom time by deadheading. 

Black-Eyed Susan

BlackEyed Susan is a wildflower that does best in full sun and prefers organically well-drained soil but can tolerate average soil even drought.

It has yellow-orange petals with a brown center, this classic flower blooms from June to September on the stalk of about three feet. If you have a large area this is a good choice however if you do not have native variety, your seedling may not replicate the diseases-resistance from their forebears.

Plant cornflower and Montauk daisy along with black-eyed Susan with a distance of 1 foot. Both the plants have similar soil and sun requirements as black-eyed Susan that make them ideal companions.

Place them in the middle position of borders and beds with ground covers like Asiatic jasmine in front and tall structure like giant allium in back. Start planting from seeds in early spring in zones 3 to 9.

Blazing Star (Liatris spicata)

The blazing star is a native wildflower that attracts pollinators like bees and butterflies in the garden. It prefers full sun, with organic-rich, well-drained soil.

If grown vertically with blossom purple, blue or pink, may reach up to 4 feet in height.

Blazing star bold linear design blooms from July to September.

And because of its study and bottom to up growth it blooms last longer in the vase arrangements.

Plant blazing star mid-story at unexpected drama or in the back of the beds and borders of structural definition.

Sow them in spring or fall in zone 3 to 8.

Clematis (Full sun to partial shade)

Clematis is a non-invasive flowering plant that grows in full sun to part shade in organic rich, well-drained soil.

They bloom in the spring and summer and some are fragrant. It has a color range from velvety burgundy to downy white, strewn along the vine that grows about 12 feet in height.

You can arrange over a wall, or anywhere to want to fill with a mass profusion of blooms.

Sow seeds in spring or fall. Do not prune them till it gets fully established and then only on varieties that do not produce new shoots or old wood.

Coneflower (Echinacea)

Cornflower is a garden staple that prefers full sun with organic-rich, sandy, well-drained soil. Native purple cornflower and its cultivar do better than today’s orange and yellow hybrids.

Cornflowers grow up to 3 feet long, look great with black-eyed Susan. It provides consistent, long-lasting mid-level colors of flowers.

Sow seeds in the zone 3 to 9, mix garden, bed, borders and stand alone drifts.

Cranesbill Geranium

Cranesbill geranium or hardy geranium is a mounding species that thrive in average well-drained soil. It works as a filler plant in the middle of the garden bed or borders with shrubs behind and shorter flora in front.

In the autumn, it passes gold and umber shade to the garden with showy blossom. It appears from spring till frost. Choose cultivar colors of pink, purple, blue, and white.

Plant it in early spring in zones 4 to 9. Divide as required in the spring or fall. 

Daylily (Hemerocallis)

The daylily is a clumping root plant that blooms only for one day. It has bold, shapely flowers in a color range of white, orange, pink, yellow, red, and purple. This plant thrives in full sun in rich compost, well-drained soil.

It has elegant-shaped flowers that grow about four feet taller in height. Daylilies look best in mass with spring, summer, and fall bloomers continuously from spring to frost. Use its taller varieties as stand-along or plant back of the border in the gardening bed. Short varieties can be planted as frontages with a swath of colors. Plant daylilies in spring or fall in zone 3 to 9. You can deadhead plants to increase bool time and divide it every two years.

English Lavender

Lavender is a perennial herb known for its purple bloom, with a sweet fragrance. It mostly uses medicinal and culinary purposes. But you can grow easy lavender in a pot or garden. This herb thrives in full sun, with dry and sandy soil that is fit for pots, containers, and garden beds.

Lavender’s best part is no doubt its fragrance. Place it near the garden bed or border perimeter to encourage blooming plants and release its sweet aroma. 

Lavenders come in many varieties but English and french varieties are most common.

Siberian Iris

  • Zone: 3 to 8
  • Height: 4 feet
  • Colors: Pink, purple, white and Yellow
  • Sunlight: Full sun to part sun
  • Bloom time: Spring to fall

Siberian iris is another beautiful perennial flower. It has colorful flowers like pink, purple, white, and yellow with height up to 4 feet. Siberian iris thrive in full sun to part sun, in organic rich soil with moist but well drained soil. These tall cultivars are great for the back of the garden bed.  

Seberian iris is suitable in zones 3 to 8, where it is planted in spring and fall. 

Giant Allium

  • Zone: 5 to 8
  • Height: 5 feet
  • Colors: Pink, purple, white
  • Sunlight: Full sun
  • Bloom time: May to June

Hellebore

  • Zone: 4 to 9
  • Height: 1 foot
  • Colors: green, pink, yellow, and red.
  • Sunlight: Full sun to part sun
  • Bloom time: Spring

New England Aster

  • Zone: 4 to 8
  • Height: 6 feet
  • Colors:  pink, purple and red.
  • Sunlight: Full sun to part sun
  • Bloom time: August to September

Montauk Daisy

  • Zone: 5 to 9
  • Height: 1 to 3  feet
  • Colors:  pink, purple and red.
  • Sunlight: Full sun
  • Bloom time: spring to early fall

Perennial Tickseed

  • Zone: 4 to 9
  • Height: 1 to 3  feet
  • Colors:  yellow-orange
  • Sunlight: Full sun
  • Bloom time: May to July

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