By: Ava Green

One of the best things about living in southern Ontario is the beautiful show our deciduous trees and shrubs put on each fall. 

Autumn is also the perfect time to plant trees, shrubs, and perennials. The sun is less intense, temperatures are slightly cooler, and with regular, deep watering, the plants are less prone to transplant shock, ensuring a successful planting. 

As the leaves begin to change, they mark the arrival of autumn, a season full of colour and celebration. If fall is a special time of year for you, our staff have handpicked their favourite deciduous trees and shrubs with the most stunning seasonal displays. Here are their top recommendations.

Autumn Blaze Maple

Botanical Name: Acer x freemanii 'Jeffersred'

This tree is a cross between the fast-growing Silver Maple and the showy Red Maple - two very popular trees! 

Autumn Blaze will provide a display of colour throughout autumn by starting earlier and lasting longer than most other trees. It’s large, with 5-inch leaves that begin by turning red at the top, then eventually shades of red and orange cascade down the length of the tree. 

Even in the winter, this is a beautiful specimen because its shape is so symmetrical.

Seven-Son Flower

Botanical Name: Heptacodium miconioides

Considered a small tree or large shrub, Seven-Son Flower is popular for its year-round beauty! 

Growing to a maximum of 6.1 metres (20 feet) tall and 3 metres (9.8 feet) wide, the leaves of this plant change from spring to summer, making it an interesting specimen plant in the garden. 

The biggest attraction is the fragrant white blooms it produces late in summer, which are highly attractive to hummingbirds and other pollinators. As the blooms fall, they leave behind pink sepals, so it looks like it’s in bloom all over again!

Its unusual bark makes this tree beautiful year-round, but especially in the winter.

Washington Hawthorn

Botanical Name: Crataegus phaenopyrum

Leaves that turn vibrant shades of orange, purple or scarlet red in the fall are just part of the beauty of this small tree.

This is another specimen with year-round interest. In early spring, reddish-purple leaves emerge, which eventually turn dark green, followed by graceful white flowers. After its fall show, it produces bright red berries that last for most of the winter.

Maturing at 8 to 9 metres (25-30 feet) tall, Washington Hawthorn is also an important nectar plant for pollinators and provides food for birds in the winter.

Barberries

Botanical Name: Berberis thunbergii

Depending on the type of Barberry these deciduous shrubs can grow ½ to 3 metres (1-10 feet) tall and have varied shapes and features as well. For example:

• Barberry, Concorde (Berberis thunbergii 'Concorde')forms a nice globe when it's mature. Leaves start out red and gradually turn a deep, dark purple as they mature.
• Barberry, Ruby Carousel (Berberis thunbergii 'Bailone') is a compact variety with vibrant, ruby-red foliage.
• Barberry, Rose Glow (Berberis thunbergii 'Rose Glow') which matures to 1 to 1 ½ metres (3-5 feet) tall, starts out with a combination of green, white, and deep rose-red foliage in the spring. In the fall, it produces bright red berries that persist into winter.

Beautyberry, Pearl Glam

Botanical Name: Callicarpa 'NCCX2'

While many Beautyberry are showy in the fall, Pearl Glam is an upright, small shrub that has all-season interest. Its dark purple foliage emerges in the spring that lasts until frost. 

In late summer it’s adorned with white flowers which attract butterflies and bees. After blooming it produces hundreds of beautiful violet-purple berries which last long after the leaves have fallen.

Crepe Myrtle, Cherry Mocha

Botanical Name: Lagerstroemia 'Cherry Mocha'

Another small ornamental deciduous shrub with an upright growing habit, Cherry Mocha Crepe Myrtle has decorative appeal in every season.

Burgundy coloured stems with semi-glossy burgundy leaves makes this plant stand out. To add to that, new growth at the tips starts out glossy, deep red. If that’s not enough, in late summer and early fall, the blooms on this cultivar are large, cherry-red flowers which stand out from the burgundy foliage. Its flowers late in the season provide important food for bees. After flowering, green seed pods provide extra interest.

Note: Have you ever wondered why leaves on trees and shrubs change each fall? Here’s a simple explanation. During the long, sunny days of summer, trees and shrubs produce plenty of chlorophyll - the food needed to keep the leaves green. In autumn, as the days grow shorter and temperatures are cooler, there is less chlorophyll produced and the plant breaks down residual chemicals on the surface of the leaves which produces shades of red, orange and yellow.

You’ll find more information in our handy Eisings online Plant Finder!

Hydrangeas are some of the most beloved flowering shrubs around the world—you only need one look at their big, voluminous flowerheads to see why they’re so easy to love. There are hundreds of hydrangea varieties, each belonging to one of six main types. One type, in particular, known as mophead hydrangeas, is famous for a very peculiar and whimsical trait: the flowers can change colours!

The Colour-Changing Shrub

The flowers of the mophead hydrangea change as a reaction to their soil chemistry, resulting in flowers from bright pink to neon blue and every shade in between. However, the shift in shade doesn’t happen overnight—it requires some planning, and a fair bit of patience, to change your hydrangea’s colour.

The good news is that anyone can encourage their mopheads to change colours with the right supplies and a few tips! Here’s how to do it in your yard.

From Pink to Blue

When planted in alkaline soil, mophead flowers bloom in brilliant shades of pink. By increasing the acidity of the soil over time, the flowers will gradually shift to a lovely shade of lilac, and eventually, turn vivid blue with a low enough (more acidic) pH. It’s a true delight to behold this colour change taking place throughout the summer. Some crafty gardeners have even managed to create an “ombré” effect by keeping a row of soil more alkaline on one end and more acidic on the other!

There’s one caveat to the fun; however: while pink hydrangeas will readily fade to blue, it’s nearly impossible to reverse back to pink. Those who have attempted this tend to end up with a rosy purple, which is pretty enough, but never quite the same. With that said, blue mopheads are so gorgeous; there’s a good chance you’ll be happy to keep them around as-is!

How to Turn Your Hydrangeas Blue

Changing your soil pH requires the use of soil amendments, which can gradually alter the soil chemistry. If your hydrangeas are blooming pale pink to lilac, you can intensify the pink colour by adding garden lime to the soil. Follow the package directions to ensure you’re using the right amount at once, and over time, those hydrangeas will start blushing!

However, most mophead growers are in it for the blue blooms. Blue is a relatively uncommon colour in the gardening world, so those gorgeous blue blooms are highly coveted! Mopheads start blooming blue flowers once the soil pH reaches 5.5 or lower. The best way to increase the acidity of the soil is with the use of aluminum sulfate, a common soil amendment that we carry here at Eising. You’ll need to mix a quarter-ounce of aluminum sulfate into a gallon of water and soak the soil around your mopheads. You’ll get the best results by starting in spring, but you can start at any point during the season. However, once you start treating the soil, you’ll need to reapply the amendment every month until you reach the desired result, and then maintain it with an application every other month during the growing season.

To maintain the acidity of your soil, you can also fertilize with acidic compost like orange peels, coffee grounds, eggshells, or peat. While you won’t see results right away, these will help increase soil acidity in the long term, so that you eventually won’t have any need for the aluminum sulfate. 

Considerations

Before you start modifying your soil acidity, keep your other plants in mind, as well. Each plant has a different tolerance to acidity—some love it, some can’t tolerate it. As your soil acidity changes, so will your soil’s suitability for your other favourite plants, so make sure to plan around that. Keep an eye on the nursery tag when you shop for plants to grow around your mopheads to ensure you’re leaving with a good fit. We recommend using soil tests regularly to monitor soil acidity throughout your garden. These tests are quick and easy to use, and lots of fun to do with kids!

 

A garden full of pink, purple, and blue hydrangeas is a truly magical place—and the pride of many Southern Ontario gardeners. Chat with us in-store for plant and product recommendations as you embark on this ultra-popular gardening project. Then, prepare to be spellbound by these enchanting shrubs!