Best Flowering Shrubs for Your Garden This Summer | Ottawa Garden Centre

Best Flowering Shrubs for Your Garden in 2026

Enjoy beautiful, low maintenance, and easy to grow summer blooming shrubs in your garden this season.

Shrubs are some of the hardest working plants in the landscape, offering structure, colour, and interest with far less effort than many annuals and perennials. Here are our picks for the best flowering shrubs to add beauty and reliability to your garden.

Why You Should Plant Another Shrub This Season

Shrubs are the bones of every garden. They give structure, fill space, and provide continuity throughout the seasons. Many gardeners are moving toward planting more shrubs because they offer long lasting beauty with minimal maintenance.

The key to success when landscaping with shrubs is understanding the light conditions in your garden and respecting the plant’s mature size. Full sun shrubs will not thrive in shade, and a shrub that naturally grows five to six feet tall cannot be kept at three feet indefinitely. Choosing the right plant for the right place makes all the difference.

flowering shrubs for Ottawa gardeners sold at Gemmells Garden Center in Smiths Falls

Which Shrubs Flower All Summer

This is the number one question we hear at the garden centre, and the honest answer is none. There are shrubs that bloom for a long time, such as potentilla and spirea, and others that rebloom, including dwarf lilacs and weigela, but nothing flowers continuously all summer except annuals.

The secret is to choose shrubs that flower at different times throughout the season. With so many options available, you can enjoy spring, summer, and fall interest without relying on constant blooms.

Here are a few of my favourite flowering shrubs this season, in no particular order.

The Best Flowering Shrubs for Your Garden

Hydrangea Bobo - Hydrangea paniculata

This compact hydrangea is covered in large white blooms in mid to late summer. As nights cool, the flowers gradually turn soft pink. Perfect for front borders and small gardens. Tough and reliable, and named by one of our own staff. Grows approximately one metre by one metre in full sun or part shade.

flowering shrubs for Ottawa gardeners sold at Gemmells Garden Center in Smiths Falls

Serviceberry - Amelanchier canadensis

A must have native shrub that offers something in every season. White spring flowers are followed by purple berries that birds love, then stunning red, orange, and yellow fall foliage. An underused gem in landscape design. Grows six metres by three metres in sun or part shade.

flowering shrubs for Ottawa gardeners sold at Gemmells Garden Center in Smiths Falls

Barberry Concord - Berberis thunbergii

Although we love all barberries, this is a standout. A well behaved, dwarf, rounded shrub with rich deep purple foliage. Extremely tough, drought tolerant, and low maintenance, with excellent colour contrast in the garden. Grows approximately forty by fifty centimetres in full sun.

flowering shrubs for Ottawa gardeners sold at Gemmells Garden Center in Smiths Falls

Summer Sweet Hummingbird - Clethra alnifolia

A unique shrub with fragrant white, candle like flowers that bloom in mid summer. An excellent choice for part shade gardens and a must have for collectors. Grows approximately seventy by seventy centimetres. Hardy to Zone 3.

flowering shrubs for Ottawa gardeners sold at Gemmells Garden Center in Smiths Falls

Abelia mosanensis

An old fashioned shrub that deserves more attention. Soft white and pink flowers perfume the air with a jasmine like scent in late May or early June. Features an elegant growth habit, attractive seed heads, and beautiful orange fall foliage. Grows one and a half metres by one and a half metres in full sun.

flowering shrubs for Ottawa gardeners sold at Gemmells Garden Center in Smiths Falls

Elderberry - Sambucus canadensis

Once believed to ward off evil spirits when planted near the home, this large shrub is well worth the space if you have it. Green cut leaf foliage is topped with flat white flower clusters, followed by edible berries you can use for jelly or wine if the birds do not get them first. Excellent as a privacy planting. Grows four metres by four metres and tolerates shade.

While it is impossible to cover all our favourites in one article, these shrubs are unique choices that many gardeners may not have considered. If you are looking to fill your garden with beautiful, low maintenance plants that perform year after year, consider planting more shrubs this season. I promise you will not be disappointed.

Kelly Heath
Retail Manager
Gemmell’s Garden Centre

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