COLUMN: A fall garden’s last hurrah

Move over, Hawaii. We have our own beautiful hibiscus to light up our summer gardens.

The Hibiscus red heart is a variety of a plant that has been cultivated in England since the 16th century.

The Hibiscus red heart is a variety of a plant that has been cultivated in England since the 16th century.

Gardening, by Brian Minter

Move over, Hawaii. We have our own beautiful hibiscus to light up our summer gardens.

Perhaps one of the most under-used summer flowering shrub is the hardy Hibiscus syriacus althaea or Rose of Sharon. It has been cultivated in England since the 16th century, but it is only over the past few years that, because of today’s many new varieties, it has become a more mainstream plant.

Hardy to zone six, and possibly some high zone fives, it is one of the few flowering shrubs that opens in succession from July through to October. Once the hydrangeas finish, there is a distinct lack of garden colour from flowering shrubs, and that’s why these plants are so important. Hibiscus are generally the last flowering shrub to show leaves in spring but they more than make up for it by being the last hurrah in the fall garden.

Hibiscus can be somewhat difficult to get established. They need full sun or just a touch of shade and a little tender loving care to get going and to perform their best.  Hibiscus grow just fine in a wide variety of well drained soils, but they need plenty of organic matter to hold moisture.  They wilt easily in hot weather and need a deep watering during periods of long drought. Don’t move them around the garden as they are not happy  being transplanted. It’s also a good idea to mulch their roots over the first couple of winters to protect them from deep frost.

Hibiscus are small to medium sized plants, usually sold in bush form, but they can also be purchased or trained into a handsome tree form. Growing to about 3.5 meters (12 feet), they can easily be pruned in late winter to conform their size to your garden needs.

There are three flower forms: large singles, semi-double and smaller doubles. My favourite is Red Heart, a large white single with a red eye that really shows up in the garden.

Diana is a huge pure white triploid that remains open at night. Minerva is a large lavender and almost everyone’s favourite. Woodbridge is a single magenta rose with a red eye.  Bluebird and Marina are improved forms of a single blue with a red eye. In the double forms, Ardens is a purple and Collie Mullens is a magenta rose with a crimson eye.

The newest series from Spring Meadows Nursery in Michigan is the Chiffon Series featuring beautiful large, full semi-doubles.  The blue, lavender, white and pink Chiffons are quite spectacular

Some very innovative growers are planting two colours together in one container, providing a beautiful two tone effect for a novel addition to any garden.

They are just blooming now in most nurseries, and it’s a great time to see all the varieties to make a choice for your garden.

Planted now, they will light up your summer garden for years to come.

 

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